Of Which of the Following ICMP Replies Are There Two

Multiple Choice

Of which of the following ICMP replies are there two versions, which are: the standard version that simply states the packet had the Don't Fragment bit set when it reached a router that needed to fragment it, and the PMTU version that includes information about the restricting link?

A) Code 2: Protocol Unreachable
B) Code 3: Port Unreachable
C) Code 4: Fragmentation Needed and Don't Fragment Was Set
D) Code 5: Source Route Failed