Operating System (OS)
In analyzing the compilation of PL/I program, the description "creation of more optimal matrix" is associated with

Machine independent optimization
Syntax analysis
Assembly and output
None of these
Code generation

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Operating System (OS)
Under virtual storage,

only the active pages of a program are stored in primary storage
interprogram interference may occur
two or more programs are stored concurrently in primary storage
a single program is processed by two or more CPUs
None of these

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