Which of the following documents is described in the statement below? "It is a type of procurement document used to request proposals from prospective sellers of products or services."

A Request for Quote (RFQ) asks vendors specifically for pricing information on a well-defined product or service, not an open proposal for how to fulfill a need.

A Request for Information (RFI) is used to gather general market information or vendor capabilities during early planning, before a formal procurement process begins.

A Request for Bid (RFB) - also called Invitation for Bid (IFB) - solicits competitive bids on clearly specified requirements where price is the primary selection criterion, not a full proposal.

An RFP is issued when a buyer wants prospective sellers to propose how they would meet a requirement, allowing comparison of methodology, experience, and cost. It is broader than a quote or bid because it invites sellers to define their own approach. This matches the question's description of requesting proposals from prospective sellers of products or services.