Which transport mechanism is used between a RADIUS authenticator and a RADIUS authentication server? 

Answer options:

A. UDP, with only the password in the Access-Request packet encrypted
B. UDP, with the whole packet body encrypted
C. TCP, with only the password in the Access-Request packet encrypted
D. EAPOL, with TLS encrypting the entire packet
E. UDP RADIUS encapsulated in the EAP mode enforced by the authentication server.

A