Computer Networking
MAC is

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

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Computer Networking
Bus is

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

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