Computer Networking
Bus is

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

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Computer Networking
RS-232-G

requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
is an interface between two data circuit terminating equipment as examplified by a local and remote modem
specifies only the mechanical characteristics of an interface by providing a 25-pin connector
None of these
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment

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