During the operation of the DHCP protocol, what conditions will use DHCP REQUEST messages? (Multiple Choice)

During the operation of the DHCP protocol, what conditions will use DHCP REQUEST messages? (Multiple Choice)
A . After the client is initialized, the broadcast DHCP REQUEST packet is sent to respond to the DHCP OFFER packet of the server.
B . When the client finds that the IP address assigned to it by the server conflicts, it will notify the server by sending this message, and will re-address the address to the server.
C . When the client has been bound to an IP address. Send a DHCP REQUEST packet to update the lease of the IP address
D . After the client restarts, it sends a broadcast DHCP REQUEST message to confirm the configuration information such as the previously assigned IP address.

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Answer: ACD