Which of the following statements about DHCP is wrong?

Which of the following statements about DHCP is wrong?
A . Multiple DHCP servers are not allowed in the network at the same time, because multiple servers will respond at the same time, and the client cannot choose an address
B . The Discover message between the DHCP Relay and the DHCP server is a unicast message
C . If the client gives up the current IP address, uses the DHCPRELEASE message to notify the server, and the server reclaims this address for the next use.
D . The packet exchanges experienced by DHCP to obtain an address normally include Discover, offer, Request and ACK

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Answer: B