Which EAP method is known as the outer authentication method?

Which EAP method is known as the outer authentication method?
A . PEAP
B. EAP-GTC
C. EAP-TLS
D. MSCHAPV2

Answer: A

Explanation:

PEAP is known as the outer authentication method because it establishes a secure tunnel between the client and the server using TLS. The inner authentication method, such as EAP-GTC, EAP-TLS, or MSCHAPV2, is then used to authenticate the client within the tunnel.

Reference: https://docs.fortinet.com/document/fortiauthenticator/6.4.0/administration-guide/906179/wireless-802-1x-authentication#peap