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

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

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Operating System (OS)
Identify false statement

You can find deleted files in recycle bin
You can right click and choose Empty Recycle Bin to clean it at once
You can increase free space of disk by sending files in recycle bin
You can restore any files in recycle bin if you ever need

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