What constitutes proper documentation to support an advance payment?

What constitutes proper documentation to support an advance payment?

• A. Documentation of purpose and conditions for repayment or deliverables.
• B. A memo describing the need for funds, without contract/regulation reference.
• C. Verification from a vendor portal without contract reference.
• D. Authorization by contract or regulation and supported by security or guarantees; documentation of purpose and conditions for repayment or deliverables.

Answer: (D)