How does a DHCP server dynamically assign IP addresses to hosts?

A.
Addresses are permanently assigned so that the host uses the same address at all times.

B.
Addresses are assigned for a fixed period of time. At the end of the period, a new request for
an address must be made, and another address is then assigned.

C.
Addresses are leased to hosts. A host will usually keep the same address by periodically
contacting the DHCP server to renew the lease.

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