______ is used by ______ for authentication.

• A. EAP, RADIUS
• B. RADIUS, EAP
• C. Both A and B
• D. Neither A nor B

Answer: (A)

EAP is used by RADIUS for authentication. EAP provides a flexible authentication framework, and in many network access scenarios (like 802.1X for Wi‑Fi or wired access) the authenticator forwards EAP messages to a RADIUS server. The RADIUS server then handles the actual decision, using the chosen EAP method (such as EAP-TLS or PEAP) to verify credentials and grant or deny access. In this setup, EAP runs inside the RADIUS exchange, so the statement “EAP is used by RADIUS for authentication” best captures how these two work together.