You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.To secure SSL， you have set up the Outlook Web App （OWA）.A Company.com employee named Mia Hamm complains that she gets a Web site security certificate warning message when connecting to the Outlook Web App.You need to make sure that she does not get any warning message from the Outlook Web App. What should you do？（）

A. You should consider installing the server’s root certificate into the Trusted Root Certification Authorities store on the Client Access server.
B. You should consider accessing the Exchange Management Console （EMC） and assign an Outlook Web App mailbox policy to Mia Hamm.
C. You should consider installing the server’s root certificate into the Trusted Root Certification Authorities store on Mia Hamm’s client workstation.
D. You should consider accessing the Exchange Management Console （EMC） and set up the logon format to use the user principal name （UPN）， in the owa （Default Web Site） Properties.