You issued a Request for Quotation (RFQ) for tree removal services after a storm. Due to more urgent requirements, the issuance of the Purchase Order for the work will not be made until after expiration of the offer acceptance period. What should you do?

a. No action is required under Simplified Acquisition Procedures.

b. Request a written extension from the lowest-priced vendor(s) whose acceptance period has not expired.

c. Issue a new RFQ.

d. Request the vendor(s) to extend their acceptance period.