A network switch is configured to perform the following validation checks on its ports: All ARP requests and responses are intercepted. Each intercepted request is verified to ensure that it has a valid IP$-$to$-$MAC address binding. If the packet has a valid binding, the switch forwards the packet to the appropriate destination. If the packet has an invalid binding, the switch drops the ARP packet. Which security feature was enabled on the switch to accomplish this task? answer Port security Dynamic ARP inspection DHCP snooping IGMP snooping