Microsoft Active Directory integrated machines are not authenticating to the internal WLAN. The WLAN settings are WPA2-A

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Microsoft Active Directory integrated machines are not authenticating to the internal WLAN. The WLAN settings are WPA2-AES-802.1x and are authenticating to a
Cisco Identity Services Engine server. You investigate and note that non-domain authenticated machines are properly authenticating to the WLAN using their
Active Directory credentials. Why would this problem occur?

A. The WLAN is configured improperly in group policy.
B. The ACS server is not joined to the domain, causing authentications to fail.
C. The domain machines are configured to disable the wireless adapter.
D. The non-domain machines are using local accounts that are not authenticated through the domain.