Which statement describes the process of dynamically assigning IP addresses by the DHCP server?（）

• 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.