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
Answer: C
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