Aopt user isolation technology in WLAN networking environment, which of the following statements is wrong?
A . User isolation between groups means that users in different groups can’t communicate with each other, and internal users in the same group can communicate
B . Isolation in user groups means that users in the same group can’t communicate with each other
C . User isolation function means that Layer 2 packets associated with all wireless users on the same AP can’t forward packets to each other.
D . Group isolation and isolation between groups can’t be used at the same time