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

None of these
All of these
it is necessary to retranslate the user's program deck every time it is run.
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)
Trojan-Horse programs

None of these
usually are immediately discovered
are hidden programs that do not show up on the system
do not usually work
are legitimate programs that allow unauthorized access

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Operating System (OS)
Semaphores

are used for memory management
are used to do I/O
None of these
synchronize critical resources to prevent contention
synchronize critical resources to prevent deadlock

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