When configuring an LDAP system for integration with PAM and NSS the /etc/nsswitch.conf file
needs to be modified. What is the best choice below to fill in this line from the /etc/nsswitch.conf
file? passwd: files ___________

A.
pam

B.
ldap

C.
pam_nss

D.
pam_ldap

E.
none

Explanation:
Reference:
https://wiki.archlinux.org/index.php/LDAP_Authentication
(Configure NSS, see the second blue box and first line)