All the Following Are True About the Request for Proposal

All the following are true about the request for proposal (RFP) process except:

A) Because the RFP is so complete, vendor demonstrations and site visits are usually not necessary.
B) Because system evaluation is required, end-users should be included.
C) Because review of responses to RFPs can be time consuming, RFPs are only sent to a few vendors.
D) Because the RFP may be used as part of the system contract, it should be complete and accurate.