pany has implemented 802.1X authentication as a security enhancement. Which statement is true about 802.1x port-based authentication？（）

A. TACACS+ is the only supported authentication server type.
B. If a host initiates the authentication process and does not receive a response， it assumes it is not authorized.
C. RADIUS is the only supported authentication server type.
D. Before transmitting data， an 802.1x host must determine the authorization state of the switch.
E. Hosts are required to havea 802.1x authentication client or utilize PPPo
F. None of the other alternatives apply.