When XYZ Co. receives telephone and fax orders, the billing department prepares an invoice. The invoice is mailed immediately. A copy of the invoice serves as a shipping notice. The shipping department removes inventory from the warehouse and prepares the shipment. When the order is complete, the goods are shipped. The clerk checks the customers credit before recording the sale in the general journal and the account receivable subsidiary ledger.The receptionist opens the mail and lists all payments. The receptionist also handles all customer complaints and prepares sales return forms for defective merchandise. The cashier records all cash receipts in the general journal and makes the appropriate entry in the accounts receivable subsidiary ledger. The cashier prepares the daily bank deposit.

Required: Describe at least four internal control XYZ Co.