Microprocessor
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1, 2, 3 and 4
 1 and 2 only
 1, 2 and 3
 3 and 4 only

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of instructions being executing on the microprocessor
 holds the address of the top of the stack
 counts the number of programs being executing on the microprocessor
 keeps the address of the next instruction to be fetched

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