Microprocessor
Which one of the following is not correct?

 An interrupt signal is required at the start of every program
 An instruction is a set of bits that defines a computer operation
 Bootstrap is a technique or device for loading first instruction
 Bus is a group of wires

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Microprocessor
When RET instruction is executed by any subroutine then

 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.
 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.

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