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單項選擇題

An organization has Exchange server 2010.Network contains internal root Certification Authorization (CA).Users on network use Outlook Anywhere.A CAS server uses a wildcard certificate issued by a trusted third party root CA.You need to ensure that users can send and receive encrypted e-mail messages by using S/MIME.What should you do?()

A.Instruct all users to import the 3d-party root CA certification
B.Configure CAS server to use a certificate issued by a third-party CA
C.Instruct all users to import an internal root CA certificate
D.Deploy Outlook Web Access with the S/MIME control to the client system

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