Each VLAN is its own broadcast domain and has nothing to do with collisions (rules out A and D). Adding
VLANs without changing the number of stations will increase the number of broadcast domains and make
the number of stations in each fewer (E). VLANs make administration more complex (more configuration)
which rules out F. Traffic cannot cross between VLANs without a router (where we can put ACLs), so
network security is increased (C). VLANs do allow logical grouping of users by function (B).