【单选题】
You have an enterprise subordinate certification authority （CA）. The CA issues smart card logon  certificates.    <br /> Users are required to log on to the domain by using a smart card. Your company’s corporate  security policy states that when an employee resigns， his ability to log on to the network must be  immediately revoked.    <br /> An employee resigns. You need to immediately prevent the employee from logging on to the  domain.    <br /> What should you do（）
A、Revoke the employee’s smart card certificate.
B、Disable the employee’s Active Directory account.
C、Publish a new delta certificate revocation list （CRL）.
D、Reset the password for the employee’s Active Directory account.
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