Regarding the relationship between the two technologies of 802.1x and RADIU S, which of the following descriptions is correct?

Regarding the relationship between the two technologies of 802.1x and RADIU S, which of the following descriptions is correct?
A . 802.1x and RADIUS are different names of the same technology
B. 802.1x is a technical system, which includes RADIUS
C. 802.1x and RADIUS are different technologies, but they are often used together to complete the access control of end users.
D. 802.1x and RADIUS are two completely different technologies, and they are usually not used together

Answer: C