YouhaveanExchangeServer2010organization.UsersonthenetworkuseHTTPStoconnecttoOutlookWebApp（OWA）.TheClientAccessserverusesacertificateissuedbyaninternalcertificationauthority（CA）.Youplantodeployane-mailencryptionsolutionforallusers.Youneedtoensurethatuserscansendandreceiveencryptede-mailmessagesbyusingS\/MIMEfromOWA.Whatshouldyoudo？（）
A.Issueacertificatetoeachuser
B.InstructallOWAuserstoimportarootCAcertificate
C.ModifytheauthenticationsettingsoftheOWAvirtualdirectory
D.ConfiguretheClientAccessServertouseacertificateissuedbyathird-partyCA
参考答案：A
