Please solve the questions, especially the last question

Carrefour Company, a retail store dealing in expensive linens and clothing has a staff of about 25 salesclerks. The sales are done in cash or credit, using the store's own billing rather than credit cards. Most of the larger sales are on credit. Each salesclerk has his/her own sales book with prenumbered, three-copy, multicolored sales slips attached, but perforated. Only a central cash register is used, run by the store manager. He's been working for Mr. Tariq Mohammed, the store owner, for over 10 years. The cash register is physically positioned to monitor the entire store and the front door. All transactions are recorded in the salesclerks' sales books. The original and second copies for each sale are given to the cashier. The third copy is retained by the salesclerk in the sales book. When the sale is for cash, the customer pays the salesclerk, who marks all three copies "paid" and takes the money to the supervisor. The supervisor compares the clothing to the description on the invoice and the price on the sales tag. He also rechecks the clerk's calculations. Any corrections are approved by the salesclerk. The clerk changes his/her sales book at that time, and the items are packaged and given to the customer. A credit sale must be approved by the supervisor from an approved credit list after the salesclerk prepares the three-part invoice. Next, the supervisor enters the sale in his cash register as a credit or cash sale. The second copy of the invoice, which has been validated by the cash register, is given to the customer. Tariq must approve of any credit sales that exceed $1,000. At the end of the day, the salesclerks give their books to the supervisor, and the supervisor compares the totals to the cash register tape. He then creates a summary of the day's transactions. The cash is deposited in the bank the next morning by Tariq, and he receives a deposit slip, which he gives to the accounts receivable clerk. If Tariq is unable to deposit the money, the supervisor goes instead. The cashier's copies of the invoices are also given to the accounts receivable clerk along with a summary of the day's receipts. [1] Part 1: Instructions: a. Identify all COSO components of internal control? b. For the sales transaction-related audit objective, identify all existing controls? c. For the cash receipts transaction-related audit objective, identify all existing controls? d. What are some possible deficiencies in the store's system? e. How would you, as auditor, suggest ways to improve their system? Sarah, the accounts receivable clerk, reviews the sales books and the register tape. She inputs all sales invoice information into the firm's computer, which provides a complete printout of all input and summaries. The accounting summary includes sales by the clerk, cash sales, credit sales, and total sales. Sarah compares this output with the sum and reconciles all differences. The computer updates accounts receivable, inventory, and general ledger master file. After the update procedure has been run on the computer, Sarah's assistant files all sales included in the sales printout. Sarah uses these files to create bills that are mailed to the Customers. The mail is opened each moming by Tariq's secretary. She gives all correspondence to Tariq and all payments to the supervisor. The supervisor totals the amounts and adds this cash to the register for later deposit. He gives the total to Sarah to update customer account on the computer. Sarah uses this list and all the remittances to record cash receipts and update accounts receivable, again by computer. He reconciles the total receipts on the pre-list to the deposit slip and to her printout. At the same time, he compares the deposit slip received from the bank for cash sales to the cash receipts journal. He has online access to the store's bank account, which he accesses monthly to pay the store's bills online. The computer generates a weckly aged trial balance of accounts receivable. A separate listing of all unpaid bills is also automatically prepared, and bothare given to Mr. Tariq. He approves all write-offs of uncollectible items and forwards the list to Sarah, who writes them off. Each month Sarah mails computer-generated statements to customers. Complaints and disagreements are resolved by Mr. Tariq, who then informs Sarah in writing of any write-downs or misstatements that require correction. The computer system also automatically totals the journals and posts the totals to the general ledger. A general ledger trial balance is printed out, from which Sarah prepares financial statements. Sarah also prepares monthly bank reconciliations and reconciles the general ledger to the aged accounts receivable trial balance. Because of the importance of inventory control, Sarah prints out the inventory perpetual totals monthly, on the last day of each month. Salesclerks count all inventory after store hours on the last day of each month for comparison with the perpetuals. An inventory shortage report is provided to Mr. Tariq. The perpetuals are adjusted by Sarah after Mr. Tariq has approved the adjustments