Computer Networking
RS-232-G

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

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Computer Networking
A front-end processor is

preliminary processor of batch jobs.
a user computer system
a minicomputer that relieves main-frame computers at a computer centre of communications control functions
None of these
a processor in a large-scale computer that executes operating system instructions

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