Which of the following statements is CORRECT about the automatic switchboard configuration of U1960?

Which of the following statements is CORRECT about the automatic switchboard configuration of U1960?
A . The automatic switchboard number can be the same as a user’s short number or long number, because the priority of the automatic switchboard service is higher than that of calls for common users.
B . The value of callcategory for the prefix of the automatic switchboard number must be vu.
C . The value of callattribute for the prefix of the automatic switchboard number must be vuselfdefine.
D . The system does not provide greetings for the automatic switchboard service by default. Customers must record the greetings themselves.

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Answer: B