A method for a user to identify and present credentials only once to a system is known as:

A.
SEC

B.
IPSec

C.
SSO

D.
SSL

Explanation:
Single Sign-On (SSO) – This is a method for a users to identify and present credentials
only once to a system. Information needed for future system access to resources is
forwarded by the initial System.
BENEFITS
More efficient user log-on process
Users select stronger passwords
Inactivity timeout and attempt thresholds applied uniformly closer to user point of
entry
Improved timely disabling of all network/computer accounts for terminated users