Language Processors
Multiprogramming was made possible by

operating systems
neither (a) nor (b)
both (a) and (b)
input/output units that operate independently of the CPU

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Language Processors
A compiler is

a program that automate the translation of assembly language into machine language
is a program that appears to execute a source program as if it were machine language
a program that places programs into memory and prepares them for execution
program that accepts a program written in a high level language and produces an object program

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