which statement is true?

Refer to the exhibit. Based upon the information in the exhibit, which statement is true?

A.
DHCP requests from the host will be rebroadcasted to R2.

B.
To complete this configuration, the R1 fa0/0 interface must be configured with the ip
helper-addresses command.

C.
To complete this configuration, the R2 fa0/0 interface must be configured with the ip
helper-addresses command.

D.
R1 will forward all DHCP requests to both 192.168.100.1 and 192.168.200.1 as unicast
messages.

E.
R1 will forward DHCP requests to 192.168.100.1. If there is no response, R1 will then
forward the requests to 192.168.200.1.

Explanation:
A DHCP relay agent is any host that forwards DHCP packets between clients and servers.
Relay agents receive DHCP messages and then generate a new DHCP message to send
out on another interface. The agents forward requests and replies between clients and
servers when they are not on the same physical subnet.
The Cisco IOS DHCP relay agent is enabled on an interface only when the ip helper-address
is configured.
If multiple helper-addresses are configured, it tries to get response from first, if no response
got from the first helper address then sends the request to second one.