A packet capture indicates that the router is not forwarding the DHCP packets that it receives on interface FastEthernet0/0. Which command needs to be entered in global configuration mode to resolve this issue?
C is the correct answer.
Prerequisites for Configuring the Cisco IOS DHCP Relay Agent
Before you configure the DHCP relay agent, you should understand the concepts documented in the "DHCP Overview" module.
The Cisco IOS DHCP server and relay agent are enabled by default. You can verify if they have been disabled by checking your configuration file. If they have been disabled, the no service dhcp command will appear in the configuration file. Use the service dhcp command to reenable the functionality if necessary.
https://www.cisco.com/en/US/docs/ios/12_4t/ip_addr/configuration/guide/htdhcpre.html#wp1096452
ip helper-address command is configured under the interface and the question states which commands needs to be entered in the global configuration mode so the answer is not correct.
ip forward-protocol specifies additional broadcast services that can be forwarded, however DHCP is one of the 8 protocols that are forwarded by default by the ip helper-address command ( the others are Time, TACACS, DNS, TFTP, NetBIOS). So ip forward-protocol is not correct either.
ip dhcp relay is to configure additional option for the relay.
I have configured ip helper address many times and it works out of the box by just configuring the ip helper-address command under a interface. The only way it won't work is if the service DHCP is turnned off for some reason which will disable both the DHCP server and relay agent functions on the router so in my opinion this answer makes most sense considering the question is worded
D
"Enabling a helper address or UDP flooding on an interface causes the Cisco IOS software to forward particular broadcast packets. You can use the ip forward-protocol command to specify exactly which types of broadcast packets you would like to have forwarded."
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/command/iap-cr-book/iap-i1.html#wp1776761080
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