A claim by a procurement agency shall be asserted by written notice to the contractor and the procurement officer explaining: The basis for the claim; To the extent known, the amount of claim or performance or other action required of the contractor; and The time within which the contractor shall provide a written response. If appropriate, the procurement officer may conduct discussions or negotiations with the contractor. If the contractor fails to respond, provides an inadequate response, or denies the claim or the relief sought by the procurement agency in whole or in part, the procurement officer shall proceed in accordance with Regulation .08 of this chapter. The provisions of §§A, B, and C of this regulation do not apply if notice of claim is not required under the terms of the contract or under the circumstances, in which case the procurement officer shall proceed in accordance with Regulation .08 of this chapter.