Which of the following documents provides contractors with performance requirements, including classification guidance?

The correct answer is DD Form 254, which is specifically used to provide contractors with essential performance requirements, including classified information and appropriate classification guidance. This form outlines the scope of the work, the security requirements associated with it, and any necessary classifications that contractors need to adhere to while handling sensitive information.

DD Form 254 ensures that contractors are fully informed about their obligations related to the protection of classified materials, facilitating compliance with established security protocols. It serves as a critical tool for government agencies in managing the security aspects of contractor engagements, ensuring that all parties understand how to properly handle, mitigate, and protect classified information throughout the duration of the contract.

In contrast, the other forms listed serve different functions: SF 86 is used for security clearance applications, SF 312 is an agreement concerning the safeguarding of classified information, and DD Form 2220 is related to the issuance and control of classified documents but does not specifically delineate performance requirements for contractors like DD Form 254 does.