what does a gray question mark beside Other Components – Domains indicate?

In the View Administrator Dashboard, what does a gray question mark beside Other Components –

Domains indicate?

In the View Administrator Dashboard, what does a gray question mark beside Other Components –

Domains indicate?

A.
The domain is Active Directory 2008-based.

B.
The domain is LDAP-based.

C.
The domain is Active Directory 2000-based.

D.
The domain is Kerberos-based.