What does FAR specify as essential for contract modifications?

The Federal Acquisition Regulation (FAR) emphasizes that contractor's consent is critical for contract modifications because modifications often involve changes in the terms, conditions, price, or performance of a contract. When a modification is proposed, it typically alters the scope or other essential elements of the contract, thereby necessitating the agreement of both parties to ensure that the contractor acknowledges and accepts these changes.

Without the contractor's consent, any modification would be unilaterally imposed, which could lead to disputes or claims related to the contract's terms. This requirement helps maintain a cooperative relationship between the contracting agency and the contractor, ensuring that both parties are in agreement about the adjustments being made to the contract.

The other options, while relevant in different contexts, do not directly address the necessity of mutual agreement in the modification process as stipulated in FAR.