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.
it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.
None of these
it is necessary to retranslate the user's program deck every time it is run.
All of these

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Operating System (OS)
All of the following are task performed by the operating system except

Managing hardware on the computer
Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation
Provides an interface for user to interact with computer

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