An RFP may be amended by the SPOC by issuing a written addendum prior to the date and time set for receipt of proposals. Such addenda shall be posted on eVA and the agency website where the RFP is displayed. All addenda must be signed and returned by all suppliers to the SPOC with their proposals. If a deadline extension is granted to any supplier it must be granted to all of the suppliers. VITA does not accept late proposals.