Which of the following is the most effective control to prevent unauthorized entrance of a former employee of the organization?

Which of the following is the most effective control to prevent unauthorized entrance of a former employee of the organization?
A . Revoking the former employee’s biometrics from the entrance systems
B . Installing security guards who have undergone a background check at all entrances.
C . Installing multiple high-powered surveillance cameras throughout the organization
D . Keeping doors locked and accessible with a key that is provided only to employees

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Answer: A