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

it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.
All of these
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.

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
None of these
not used on multiprogramming systems
not used in modern operating system
critical for even the simplest operating systems

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