What reaction can be expected from the host when a router sends an ICMP packet, with the Type 3 (host unreachable) and Code 4 (DF bit set) flags set, back to the originating host?

What reaction can be expected from the host when a router sends an ICMP packet, with the Type 3 (host unreachable) and Code 4 (DF bit set) flags set, back to the originating host?

A.
The host should reduce the size of future packets it may send to the router.

B.
This scenario is not possible because the packet will be fragmented and sent to the original destination.

C.
The sending station will stop sending packets, due to the router not expecting to see the DF bit in the incoming packet.

D.
The sending station will clear the DF bit and resend the packet.