C does seem to be the most correct.
"RADIUS combines authentication and authorization. The access-accept packets sent by the RADIUS server to the client contain authorization information. This makes it difficult to decouple authentication and authorization."
Source: https://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/13838-10.html
Correct answer is C, "In RADIUS, authentication and authorization are coupled together"
https://www.cisco.com/c/en/us/support/docs/security-vpn/remote-authentication-dial-user-service-radius/12433-32.html
You can find the answer in the "RADIUS Authentication and Authorization Sequence" diagram
RADIUS
open standard protocol
It uses UDP as a transmission protocol
It uses UDP port number 1812 for authentication and authorization and 1813 for accounting.
Authentication and Authorization are COMBINED in RADIUS.
Only the password is encrypted while the other information such as username, accounting information, etc are not encrypted.
No external authorization of commands is supported.
No multiprotocol support.
Used for network access
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