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

All of these
it is necessary to retranslate the user's program deck every time it is run.
None 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.
a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.

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Operating System (OS)
Object code

None of these
is ready to execute
must be rewritten before execution
is the output of compilers, but not assemblers
must be "loaded" before execution

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

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

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