An organization is implementing a network access control mechanism and requires a method that accommodates both certificate-based and password-based user authentications within a secure channel. Which protocol should they implement to satisfy this need while integrating with their network's existing access control?
Lightweight EAP (LEAP)
EAP Message Digest 5 (EAP-MD5)
Protected EAP (PEAP)
EAP-Flexible Authentication via Secure Tunneling (EAP-FAST)
EAP-Transport Layer Security (EAP-TLS)
EAP-Tunneled Transport Layer Security (EAP-TTLS)