The security department has implemented a new laptop encryption product in the environment. The product requires one user name and password at the time of
boot up and also another password after the operating system has finished loading. This setup is using which of the following authentication types?

A.
Two-factor authentication

B.
Single sign-on

C.
Multifactor authentication

D.
Single factor authentication

Explanation:
Single-factor authentication is when only one authentication factor is used. In this case, Something you know is being used as an authentication factor. Username,
password, and PIN form part of Something you know.
Incorrect Answers:
A: Two-factor authentication is when two different authentication factors are provided for authentication purposes.
B: Single sign-on means that once a user (or other subject) is authenticated into a realm, re- authentication is not required for access to resources on any realm
entity.
C: Multifactor authentication requires a user to provide two or more different authentication factors for authentication purposes.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp 280, 282, 284.