eSpace Desktop initiate an instant conference but fails, what is the possible reason? (Multiple choice)

eSpace Desktop initiate an instant conference but fails, what is the possible reason? (Multiple choice)
A . eSpace account has no immediate meeting privileges.
B . Data Conferencing license expired.
C . In eServer configuration file, the setting of client function parameter is error.
D . The settings of Data Conference configuration file is error.
E . The time between unified gateway, BMU and data conferencing server are not synchronized.

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Answer: ABDE