Selected below are the transactions and cases incurred for Darren Sdn. Bhd. Compare checks to invoices. Different individuals approve and make payments. 1. 2. 3. 4. 5. 6. Print check amounts by machine with indelible ink. Only designated personnel are authorized to sign checks. Each check must have approved invoice. Requiring employees to take vacations. Required: Analyze each of the cases above and explain the internal control principle behind each (6 marks) case.