Which of the following statements about CSS2 is correct?

Which of the following statements about CSS2 is correct?
A . The 10 Gigabit port of the cluster daughter card can be used as a service port at the same time.
B . The industry’s only switching network hardware cluster, which forwards control and data messages between devices directly through the switching network, without occupying valuable business slots.
C . At least one master is available for each box so that the cluster will not be split
D . The control and monitoring planes are unified. When the main control fails, the whole machine loses the monitoring plane and is down.

Answer: B