Which service unifies Linux/UNIX and Windows NT account management by allowing a UNIX box
to become a full member of an NT domain?

A.
Winbind

B.
PAM

C.
NIS

D.
OpenLDAP

Explanation:
http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/winbind.html(What
Winbind Provides, first paragraph)