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Answer : Network Layer

The Internet Control Message Protocol (ICMP) is one of the main protocols of the internet protocol suite. It is used by network devices, like routers, to send error messages indicating, for example, that a requested service is not available or that a host or router could not be reached.

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Option C. Network Layer

ICMP layer has functions whuch mainly deal with error handling. It is used by network devices, to send error messages. Error messages include messages such as requested service in unavailable OR router could not be reached.

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