Which two statements indicate something that can cause an IP phone to fail roaming when device mobility has been configured? (Choose two.)

Which two statements indicate something that can cause an IP phone to fail roaming when device mobility has been configured? (Choose two.)
A .  Device Mobility Mode is set to Off in the Cisco Unified Communications Manager service parameters while the device mobility configuration on the phone is set to default.
B .  No device mobility groups have been configured.
C .  No locations have been configured and assigned to the device pools.
D .  No physical locations have been configured and assigned to the device pools.
E .  No device mobility-related information settings were configured under the device pools.

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Answer: A,D