What is the purpose of the Usermapper on VNX?

A.
Used in CIFS-only environments to generate mappings automatically between UNIX UID/GID
and Windows user/groups

B.
Used to pull UID/GID information from NIS to generate mappings between UNIX UID/GID and
Windows user/groups

C.
Editable file that allows administrators to create special mappings between UNIX UID/GID and
Windows user/groups

D.
Used in NFS-only environments to generate mappings automatically between UNIX UID/GID
and Windows user/groups