FAR 14.404-5
All or none qualifications.
Unless the solicitation provides otherwise, a bid may be responsive notwithstanding that the bidder specifies that award will be accepted only on all, or a specified group, of the items. Bidders shall not be permitted to withdraw or modify "all or none" qualifications after bid opening since such qualifications are substantive and affect the rights of other bidders.
Source: acquisition.gov — FAR
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