Which of the following description of the role of the free ARP message is wrong?

Which of the following description of the role of the free ARP message is wrong?
A . Used to advertise the active/standby switchover in the VRRP backup group.
B . Used to advertise a new current AC address: The sender replaces the NIC and the AC address changes. In order to notify all hosts before the AP entry ages, the sender can send a free AR
D . Used to check duplicate IP addresses: Normally, no ARP response will be received. If received, it indicates that there is an address in the network that is duplicated with its own IP address.
E . Free ARP packets are used to keep active with the gateway device when the host is idle.

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Answer: D