What is a common reason that an IP Phone cannot get its configuration from Cisco Unified Communications Manager after it obtains the correct IP address information?

What is a common reason that an IP Phone cannot get its configuration from Cisco Unified Communications Manager after it obtains the correct IP address information?
A . The DHCP scope is exhausted.
B . The DHCP server is not reachable.
C . The DHCP scope is on the wrong subnet.
D . The DHCP scope has the incorrect Option 150 or 66 defined.

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Answer: D