Youngster is a retail bookstore owned by two Friends, Lee and Linda. More than half of the customers tend to buy on account. Youngster encourages these credit customers when settling their accounts to pay directly into the businesss bank account using direct debit transfer payment method, although some prefer to pay their accounts on cash. All of the non-credit customers pay in cash. While electronically signed invoices are issued to the credit customers, receipts are not given to the non-credit customers. Any cash received from customers is kept in the newly installed safe, and later banked at Commonwealth Bank. While the bookstore is busy from morning till evening, Lee who is the finance manager insists that he must count the cash, even if it is late, before they are eventually banked. Steve, the managing director, appointed Linda to be in charge of sales. Steve heavily relies on the qualified new graduates and interns in running Youngster. He assigned Maria, a recent accounting graduate, to be responsible for collecting cash from customers and Jesse, an intern, for keeping records in their manual system. Required: Review the internal control environment in Youngster by reference to ANY THREE principles of internal control.