What is the name of GSA's electronic system for posting requirements, obtaining quotes, and issuing orders?

The correct answer is based on the functionality and purpose of the General Services Administration's (GSA) electronic systems in the context of procurement and acquisition. GSA's electronic system known as ebuy is specifically designed to facilitate the purchasing process for federal agencies. It allows users to post their requirements, request quotes from contractors, and issue orders directly through an online platform.

ebuy is part of GSA's broader suite of e-Procurement tools aimed at streamlining the acquisition process and enhancing efficiency in communications between government buyers and industry vendors. This tool is crucial for federal agencies looking to simplify their procurement processes and ensure compliance with applicable regulations.

The other choices, while they may seem relevant to e-procurement functions, do not specifically encompass the comprehensive features that ebuy offers for federal procurement activities. Thus, recognizing ebuy as the GSA's designated system for these tasks clearly underscores its integrated role in fostering an efficient procurement environment for government agencies.