When a single MCU port capacity is insufficient for a multipoint conference, which of the following methods can be adopted to ensure the normal holding of the conference?

When a single MCU port capacity is insufficient for a multipoint conference, which of the following methods can be adopted to ensure the normal holding of the conference?
A . Add a new participant terminal
B . Add MCU to this service area
C . Change the venue terminal number prefix
D . Change the number prefix of the MCU

Answer: B