48 CFR § 52.214-3 - Amendments to Invitations for Bids.
As prescribed in 14.201-6(b)(1), insert the following provision:
(a) If this solicitation is amended, then all terms and conditions which are not modified remain unchanged.
(1) Bidders shall acknowledge receipt of any amendment to this solicitation -
(i) By signing and returning the amendment;
(ii) By identifying the amendment number and date in space provided for this purpose on the form for submitting a bid;
(iii) By letter;
(iv) By facsimile, if facsimile bids are authorized in the solicitation; or
(v) By email, if email bids are authorized in the solicitation.
(2) The Government must receive the acknowledgement by the time and at the place specified for receipt of bids.