Microprocessor
The stack is nothing but a set of

 reserved I/O address space
 reserved RAM address space
None of these
 reserved ROM address space

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Microprocessor
The interrupt facility is provided in microprocessor to

 keep a control on the working of the microprocessor
 stop the microprocessor when it starts malfunctioning
 stop the microprocessor when desired
 change the sequence of the instructions being executed

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