Computer Networking
A characteristic of a multiprogramming system is:

All listed here
simultaneous execution of program instructions from two applications
None of these
multiple CPUs
concurrent processing of two or more programs

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Computer Networking
RS-449/442-A/423-A is

a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression the resulting expression will not conform to the rules of construction and
the ratio of the number of data units in error to the total number of data units
None of these
a check bit appended to an array of binary digits to make the sum of the all the binary digits
a set of physical layer standards developed by EIA and intended to replace RS-232-

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