FAR Part 43 is primarily concerned with which of the following?

FAR Part 43 specifically addresses contract modifications, which are necessary to adapt to changing circumstances throughout the duration of a contract. It outlines the procedures and requirements for making changes to a contract, ensuring that both parties are properly informed and that modifications are documented formally.

This part of the FAR provides guidance on the types of modifications that can be made, such as administrative changes, changes authorized by clauses in the contract, and those that involve a change in terms or conditions. It ensures the integrity of the contract process while allowing for flexibility in contract management.

Understanding this framework is essential for contracting officers and professionals as it lays the groundwork for how modifications should be handled legally and effectively, ensuring compliance with federal regulations. The other options, while important in their own right, do not pertain to the primary focus of FAR Part 43.