Operating System (OS)
The disadvantages of "Compile and Go" loading scheme is (are):

a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
None of these
it is necessary to retranslate the user's program deck every time it is run.
All of these
it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.

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Operating System (OS)
The term "operating system" means

None of these
a set of programs which controls computer working
the way a computer operator works
conversion of high level language into machine code
the way a floppy disk drive operates

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