How does a DHCP client request its previously used IP address in a DHCP DISCOVER packet?

How does a DHCP client request its previously used IP address in a DHCP DISCOVER packet?

A.
It is included in the CIADDR field.

B.
It is included as DHCP Option 50 in the OPTIONS field.

C.
It is included in the YIADDR field.

D.
It is the source IP address of the UDP/53 wrapper packet.

E.
The client cannot request its last IP address; it is assigned automatically by the server.

Explanation: