Which protocol do you recommend to achieve these goals?

An IT team is growing quickly and needs a solution for management device access. The solution must authenticate users from an external repository instead of the current local on the WLC, and it must also identify the user and determine what level of access users should have.

Which protocol do you recommend to achieve these goals?
A . network policy server
B . RADIUS
C . TACACS+
D . LDAP

Answer: C

Explanation:

https://www.cisco.com/c/en/us/td/docs/switches/lan/Denali_161/ConfigExamples_Technotes/Techzone_Articles/Example_and_Technotes_Denali_16_1_1/Example_and_Technotes_Denali_16_1_1_chapter_010110.pdf

https://community.cisco.com/t5/wireless-mobility-documents/wlc-and-acs-5-x-tacacs-configuration-example-web-authentication/ta-p/3120681