Microprocessor
The timing difference between a slow memory and fast processor can be resolved if

Neither A nor B
Either A or B
Processor is capable of waiting
External buffer is used

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Microprocessor
When RET instruction is executed by any subroutine then

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

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