Which command ensures that SW3 receives frames only from VLAN 50?

Refer to exhibit.

VLANs 50 and 60 exist on the trunk links between all switches All access ports on SW3 are configured for VLAN 50 and SW1 is the VTP server.

Which command ensures that SW3 receives frames only from VLAN 50?
A . SW1(config)#vtp pruning
B . SW3(config)#vtp mode transparent
C . SW2(config)=vtp pruning
D . SW1(config >»vtp mode transparent

Answer: A

Explanation:

SW3 does not have VLAN 60 so it should not receive traffic for this VLAN (sent from SW2). Therefore we should configure VTP Pruning on SW3 so that SW2 does not forward VLAN 60 traffic to SW3. Also notice that we need to configure pruning on SW1 (the VTP Server), not SW2.