Question about DHCPOFFER through a Relay

Question for you...

Is the source IP address (in the IP header) of a relayed DHCPOFFER specified in any standard/RFC?

I have seen platforms where:

• The source IP in the relayed DHCPOFFER is unchanged (i.e. the DHCP server's address)
• The source IP in the relayed DHCPOFFER is exchanged for the relay agent's address (giaddr).

FZ