After you deploy Cisco Unified Communications manager device mobility in your environment, you note that phones in a remote site are failing to register.
Which two actions correct the problem? (Choose Two)
A. Verify that remote site is assigned to the device mobility group that matches its dialing pattern
B. Verify that phones are attempting to register with correct mega cluster in the device pool of the central office
C. Verify that Extension mobility is configured correctly for the remote site
D. Verify that the LDAP server is configured to support Device Mobility at the Remote Site
E. Verify that the subnet of the remote site is configured in Device Mobility info.