Which of the following is the BEST mitigation to prevent unauthorized access?

A SIEM solution alerts a security analyst of a high number of login attempts against the company’s webmail portal. The analyst determines the login attempts used credentials from a past data breach.

Which of the following is the BEST mitigation to prevent unauthorized access?
A . Single sign-on
B . Mandatory access control
C . Multifactor authentication
D . Federation
E . Privileged access management

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Answer: C