You have an Active Directory forest named contoso.com.You install a new Exchange Server 2010 organization that contains a Client Access server named CAS1.You need to configure certificates in the organization to support the following client connections： （1）Autodiscover （2）Outlook Anywhere （3）Exchange ActiveSync What should you do？（）
- AReissue a self-signed certificate to CAS1.
- BConfigure the default Web site on CAS1 to require SSL.
- CIssue a trusted certificate that contains multiple subject alternate names.
- DInstall Active Directory Rights Management Service （AD RMS） on a member server.