Which of the following a true statements regarding the use of VLANs to segment anetwork? （）
A、They increase the size of collision domains
B、They allow logical grouping of users by function.
C、They can enhance network security.
D、They increase the size of the broadcast domain while decreasing the number of collision domains.
E、They increase the number of broadcast domains while decreasing the size of the broadcast domains.
F、They simplify switch administration.
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