A、Addresses are allocated after a negotiation between the server and the host to determine the length of the agreement.

B、Addresses are permanently assigned so that the hosts uses the same address at all times.

C、Addresses are assigned for a fixed period of time, at the end of the period, a new request for an address must be made.

D、Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.