What are the possible methods to implement a macro processor in assembly language?

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A standalone single-pass macro processorA standalone macro processor with two passesA macro processor integrated within a pass of a conventional two-pass assemblerAll of the above methodsNone of the above

Explanation

Macro processors for assembly language can be implemented in various ways: as an independent single-pass processor, as an independent two-pass processor, or as a macro processor embedded within one of the passes of a typical two-pass assembler. Therefore, all these approaches are valid.