A legal instrument that defines the rights and responsibilities of each party, the supplier (contractor/offeror), and the purchaser (government/acceptance).

• A. Systems Engineering Plan
• B. Budget Authority
• C. Contract Administration
• D. Contract

Answer: (D)

The main concept here is that a contract is the legally binding instrument that defines what each party must do and what each party is entitled to in a supplier–purchaser relationship. In procurement, the contract spells out the rights and responsibilities of the supplier (or contractor) and the government customer, including deliverables, performance standards, acceptance criteria, and acceptance procedures. It also covers payment terms, schedule, risk allocation, change control, and remedies or termination rights if terms aren’t met. This formal document provides the enforceable framework that governs the relationship and guides how disputes are resolved.

Other items describe different aspects of the project or process but do not establish the binding agreement itself. A Systems Engineering Plan outlines technical and management processes; Budget Authority concerns who can approve funds; Contract Administration refers to the ongoing management activities after a contract is in place, not the instrument that creates the rights and obligations between parties.