How should the network administrator handle the Auth server settings?

Refer to the exhibit.

A network administrator creates a guest WLAN on an Aruba Mobility Master (MM). The exhibit shows some of the settings for the WLAN.
How should the network administrator handle the Auth server settings?
A. Add an authentication server with the LDAP type and the IP address of the company AD server.
B. Add an authentication server with the LDAP type and IP address 10.10.10.10.
C. Add an authentication server with the RADIUS type and IP address 10.10.10.10.
D. Add an authentication server with the RADIUS type and the IP address of the company AD server.

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