What is causing this failure?

Use the exhibits below to answer the question.

A new phone has been added to the Cisco Unified Communications Manager, but is not registering properly.

What is causing this failure?
A . Device Pool cannot be default
B . phonei_css is the incorrect calling search space2
C . 9971 Phones do not support SIP
D . The location Hub_None has not been activated
E . MAC address is incorrect

Answer: E

Explanation:

The host name is a unique, fixed name that is automatically assigned to the phone based on its MAC address.

However, here we see that the configured MAC address is 8478ACF71D1F, but the host name shown on the 9971 Phone Information diagram shows the host name as 8478ACE71D1F.