Which of the Following Statements Regarding 802

Which of the following statements regarding 802.1X authentication, RADIUS authentication, and HWTACACS authentication are true?

A) A user cannot be authenticated by both RADIUS authentication and 802.1X authentication.
B) A user cannot be authenticated by both RADIUS authentication and HWTACACS authentication.
C) A user can be authenticated by both RADIUS authentication and HWTACACS authentication. This is more secure than using just one authentication method.
D) Users can access a network through 802.1X authentication, and can be authenticated through RADIUS authentication.