What are the roles of 802.1X authenticators and authentication servers?

A、 The authenticator stores the user account database, while the server stores access policies.
B、 The authenticator supports only EAP, while the authentication server supports only RADius.
C、 The authenticator is a RADIUS client and the authentication server is a RADIUS server.
D、 The authenticator makes access decisions and the server communicates them to the supplicant.