What is the tool and technique used to request seller responses?

A.
Procurement documents

B.
Expert judgment

C.
Bidder conferences

D.
Contract Types

Explanation:
Bidder conference (also called a contractor or vendor conference)
A meeting with prospective sellers to ensure all sellers have a clear understanding of the product or service to be procured. Bidder conferences allow sellers to query the buyer on the details of the product to help ensure that the proposal the seller creates is adequate and appropriate for the proposed agreement.