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

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

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Controlling the fuel injection system of an automobile engines
Controlling access to a shared printer in a network
Ensuring that system clock works correctly on server
Managing the access to system files in a laptop computers

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