Which technique automatically limits VLAN traffic to only the switches that require it?

A.
access lists

B.
DTP in nonegotiate

C.
VTP pruning

D.
PBR

Explanation:
VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as broadcast, multicast, unknown, and flooded unicast packets to only
the switches that require it. VTP pruning increases available bandwidth by restricting flooded traffic to those trunk links that the traffic must use to access the
appropriate network devices. By default, VTP pruning is disabled.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/vtp.html#wp1020444