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

All of these
a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
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.

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Operating System (OS)
System maintenance:

is usually not necessary
is not required if the system is well written
is necessary on all systems, regardless of how good
always requires several programs
None of these

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