What type of solicitation is required when using procedures set forth in FAR Part 14?

The correct choice is an Invitation for Bid (IFB). This type of solicitation is specifically mandated by FAR Part 14, which governs the competitive sealed bidding process. The primary purpose of the IFB is to encourage competition and ensure a transparent procurement process where contractors can submit sealed bids for a defined project or service.

In this context, the IFB process entails that all bids must be opened publicly at the time set for opening them, allowing for a clear evaluation based on the bids received. This formal bidding method promotes fairness and allows the government to award contracts based on the lowest responsive bid.

The other options do not align with the requirements of FAR Part 14. Requests for proposals (RFPs) and requests for quotations (RFQs) are used in different procurement methods, such as negotiated procurements and micro-purchases, respectively. Standard Form 33 is an official government form often used in RFPs but is not a type of solicitation by itself. Therefore, the use of an IFB is the appropriate method under the guidelines established in FAR Part 14.