When testing the configuration, the RADIUS authenticates to Cisco ISE but is being rejected. Why is the ip radius source- interface command needed for this configuration?

An administrator is adding a new switch onto the network and has configured AAA for network access control. When testing the configuration, the RADIUS authenticates to Cisco ISE but is being rejected. Why is the ip radius source- interface command needed for this configuration?
A. Only requests that originate from a configured NAS IP are accepted by a RADIUS server
B. The RADIUS authentication key is transmitted only from the defined RADIUS source interface
C. RADIUS requests are generated only by a router if a RADIUS source interface is defined.
D. Encrypted RADIUS authentication requires the RADIUS source interface be defined

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