Final answer:
An effective control plan for ensuring the security of resources within the AP/CD process is independent authorization to make payment, as it adds a level of review and oversight separate from requesting and receiving goods or services.
Step-by-step explanation:
The question asks about a control plan for ensuring security of resources within the AP/CD process, which refers to Accounts Payable/Cash Disbursements. Among the options provided, an effective control would be independent authorization to make payment. This is because independent authorization typically involves a separate individual or department from the one that requested goods/services and received them, helping to prevent unauthorized or fraudulent payments. Other options may contribute to the process but do not directly ensure the payment security as the independent authorization does.