You have an Exchange Server 2013 organization named for ADatum Inc. A user named User1 is a member of the Domain Admins

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You have an Exchange Server 2013 organization named for ADatum Inc. A user named User1 is a member of the Domain Admins group. User1 fails to synchronize a new Windows Phone device by using Exchange ActiveSync and receives an HTTP 500 error message.
User1 successfully logs on to Outlook Web App and Outlook Anywhere. You need to ensure that User1 can synchronize the new Windows Phone device by using
Exchange ActiveSync. Which two tasks should you perform? (Each correct answer presents a complete solution. Choose two.)

A. Disable permission inheritance on the User1 user account.
B. Enable permission inheritance on the User1 user account.
C. Install a trusted root certificate on the Windows Phone device.
D. Create a new mobile device mailbox policy.
E. Modify the Exchange ActiveSync policy that applies to User1’s mailbox.