How to configure dynamic ARP inspection on a VLAN?

How to configure dynamic ARP inspection on a VLAN?
A . (config)# ip arp inspection vlan
B . (config-if)# ip arp inspection vlan
C . (config)# arp inspection default
D . (config-if)# inspection arp vlan

Answer: A

Explanation:

To enable DAI on a per-VLAN basis, use the ip arp inspection vlan command in global configuration mode. To disable DAI, use the no form of this command. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr/command/iad-crbook/ ip_arp_gratuitous_through_ip_dhcp_ping_packets.html