Which feature must be enabled to eliminate the broadcasting of all unknown traffic to switches that are not participating in the specific VLAN?

A.
VTP pruning

B.
port-security

C.
storm control

D.
bpdguard

Explanation:
VTP ensures that all switches in the VTP domain are aware of all VLANs. However, there are occasions when VTP can create unnecessary traffic. All unknown
unicasts and broadcasts in a VLAN are flooded over the entire VLAN. All switches in the network receive all broadcasts, even in situations in which few users are
connected in that VLAN. VTP pruning is a feature that you use in order to eliminate or prune this unnecessary traffic.
http://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/10558- 21.html#vtp_pruning