单项选择题 Youhaveanenterprisesubordinatecertificationauthority（CA）.TheCAissuessmartcardlogoncertificates.Usersarerequiredtologontothedomainbyusingasmartcard.Yourcompany’scorporatesecuritypolicystatesthatwhenanemployeeresigns，hisabilitytologontothenetworkmustbeimmediatelyrevoked.Anemployeeresigns.Youneedtoimmediatelypreventtheemployeefromloggingontothedomain.Whatshouldyoudo（）A.Revoketheemployee’ssmartcardcertificate.B.Disabletheemployee’sActiveDirectoryaccount.C.Publishanewdeltacertificaterevocationlist（CRL）.D.Resetthepasswordfortheemployee’sActiveDirectoryaccount.