What is the cause of this problem?

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An administrator executes the debug isdn q931 command while debugging a failed call. After a test call is placed, the logs return a disconnect cause code of 1.

What is the cause of this problem?
A . The destination number rejects the call
B . The destination number is busy
C . The media resource is unavailable
D . The dialed number is not assigned to an endpoint

Answer: D