Briefing Riverbed Knowledge

What could be the issue?

Authentication fails for certain users after configuring the Server-Side Steelhead Appliance to be a RODC.
What could be the issue?

A.
These users make use of NTLM authentication.

B.
These users exclusively make use of Kerberos authentication.

C.
Overlapping open is enabled.

D.
SMB signing is required.