Microprocessor
When RET instruction is executed by any subroutine then

 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 the top of the stack will be popped out and assigned to the PC.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 the PC will be incremented after the execution of the instruction.

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Microprocessor
Assertion(A): Monostablemultivibrators (IC74121) are used in a microprocessor based system for frequency measurement. Reason(R): Microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.

 A is false but R is true.
 Both A & R are true but R is not the correct explanation of A.
 Both A & R are true and R is the correct explanation of A.
 A is true but R is false.

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