CompTIA Security+ Question L-55

In order for Emily, a client, to logon to her desktop computer, she must provide her username, password, and a four digit PIN. Which of the following authentication methods is Emily using?

A. Three factor
B. Single factor
C. Two factor
D. Four factor

Answer: B

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.