If a site administrator wants to improve the secure access to a cloud portal, which of the following would be the BEST countermeasure to implement?

If a site administrator wants to improve the secure access to a cloud portal, which of the following would be the BEST countermeasure to implement?
A . Require frequent password changes
B. Mandate multi-factor authentication (MFA)
C. Utilize role-based access control (RBAC)
D. Require separation of duties

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Answer: C