Microprocessor
A bus connected between the CPU and main memory that permits transfer of information between main memory and the CPU is known as

 DMA bus
 Control bus
 Address bus
 Memory bus

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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.
 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 PC will be incremented after the execution of the instruction.
 the top of the stack will be popped out and assigned to the PC.

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