In this section, the term “proposal” means any proposal, including a technical, management, or cost proposal, submitted by a contractor in response to the requirements of a solicitation for a competitive proposal.

Except as provided in subsection (c), a proposal in the possession or control of an agency named in section 3063 of this title may not be made available to any person under section 552 of title 5.

Subsection (b) does not apply to any proposal that is set forth or incorporated by reference in a contract entered into between the Department and the contractor that submitted the proposal.