(a) When only one bid is received in response to an invitation for bids, such bid may be considered and accepted if the contracting officer makes a written determination that:
(1) The specifications used in the invitation were not unduly restrictive;
(2) Adequate competition was solicited and it could have been reasonably assumed that more than one bid would have been submitted;
(3) The price is reasonable; and
(4) The bid is otherwise in accordance with the invitation for bids.
(b) Such a determination must be placed in the contract file.