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

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.
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)
The dispatcher

puts tasks in I/O wait
None of these
actually schedules the tasks into the processor
never changes task priorities
is always small and simple

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