Computer Networking
The Internet Control Message Protocol (ICMP)

reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
None of these
provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
All of these
allows gateways to send error a control messages to other gateways or hosts

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Computer Networking
MAC is

network access standard for connecting stations to a circuit-switched network
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued to ISO.
None of these
a method access control technique or multiple-access transmission media

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