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

None of these
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.
it is necessary to retranslate the user's program deck every time it is run.
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)
Addressing structure

All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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