In the OLT system, the ONT cannot be added successfully. Which of the following options is impossible?

In the OLT system, the ONT cannot be added successfully. Which of the following options is impossible?
A . The ONT-ID allocated by the ONT has been occupied by other ONT
B . The service templates bound to the ONT do not match
C . The SN address of the ONT already exists
D . The DBA-Profile bound to ONT does not support

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Answer: B