Which Statement Best Fits a Request for Proposal (RFP) for a Wireless

Which statement best fits a request for proposal (RFP) for a wireless system?

A) The vendor sends literature about its wireless system to several institutions to increase their business.
B) The search committee sends email requests to several vendors stating the needs of the institution for a new wireless system.
C) The steering committee sends a formal document to several vendors to ask for specific information about their wireless system.
D) A formal document is sent by a vendor who heard an institution is upgrading its monitoring system.