Final answer:
Certain tasks should be segregated to ensure proper internal controls and reduce the risk of fraud or errors.
Step-by-step explanation:
In order to ensure proper segregation of duties and internal controls, certain tasks should be segregated.
The correct answer is option D: Authorizing payment and posting to the accounts payable subsidiary ledger.
By segregating the tasks of authorizing payment and posting to the accounts payable subsidiary ledger, there is a clear separation of duties, reducing the risk of fraud or errors. This separation ensures that the authorization of payments is independent from the recording of those payments, providing a strong internal control mechanism.