Regarding the relationship between 802.1x and RADIUS, which of the following descriptions is correct?

Regarding the relationship between 802.1x and RADIUS, which of the following descriptions is correct?
A . 802.1x and RADIUS are different names for the same technology
B. 802.1x is a technical system that 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 are usually not used together

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Answer: C