Which of the following statements about gratuitous ARP packets are true? (Choose two)
A. A system can determine whether conflicting IP addresses are used by sending a gratuitous ARP packet
B. A gratuitous ARP packet uses the same format as an ARP request packet.
C. A gratuitous ARP packet can help to update an IP address.
D. A gratuitous ARP packet uses the same format as an ARP reply packet.
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