What documentation is required for expenditures over a certain amount?

The correct choice emphasizes the importance of formal documentation in financial transactions, particularly for expenditures that exceed a specified amount. A purchase request serves as an official record of intent to spend funds, ensuring that there is a clear, documented rationale for the expense. This process helps maintain accountability and transparency in the use of resources.

Receipt documentation is equally crucial as it provides proof of what was purchased and verifies that the transaction actually took place. Together, these documents create an audit trail that can be reviewed, thereby upholding the integrity of the budgeting and spending process. This practice is essential in large organizations, like the Navy, where oversight and compliance with financial regulations must be closely monitored.

Other options may involve informal methods or lack necessary documentation, which could lead to issues with accountability and verification, making them unsuitable for formal expenditure processes.