What is a characteristic of Dynamic ARP Inspection?

What is a characteristic of Dynamic ARP Inspection?
A . DAI determines the validity of an ARP packet based on valid IP to MAC address bindings from the DHCP snooping binding database.
B . In a typical network, make all ports as trusted except for the ports connecting to switches, which are untrusted.
C . DAI associates a trust state with each switch.
D . DAI intercepts all ARP requests and responses on trusted ports only.

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Answer: A