What is the cause of the error message?

Refer to the exhibit.

640-461-introducing-cisco-voice-and-unified-communications_img_042
What is the cause of the error message?
A. The command auto-reg-ephone was not added under telephony-service CLI.
B. There are no free licenses to add more phones.
C. There is no free flash space to upload firmware for the phones.
D. It is just an error message, and you only have to press OK.

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