Computer Networking
Communication network is

a collection of interconnected functional units that provides a data communications service among stations attached to the network
one or more conductors that serve as a common connection for a related group of devices
the condition with two or more stations attempt to use the same channel at the same time
None of these
a continuous frequency capable of being modulated or impressed with a second signal

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Computer Networking
MAC is

a very common bit-oriented data link protocol issued to ISO.
None of these
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 method access control technique or multiple-access transmission media

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