What administrator implement to ensure the correct AAA server processes the authentication request?

An administrator has multiple AAA servers, some Microsoft RADIUS and some ClearPass. When 802.1X users authenticate, the administrator wants to ensure that the authentication requests are handled by the appropriate AAA server. Users enter their username in this format: username@domain_name.

What administrator implement to ensure the correct AAA server processes the authentication request?
A . server matching rules for the VAP profile
B . server matching rules for the server group
C . server matching rules for the AAA profile
D . server matching rules for the 802.1X profile

Answer: B