Microprocessor
While CMP B instruction executes,

 no flags will be affected.
 all flags will be affected.
 only carry flag will be affected.
 only carry and zero flags will be affected.

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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 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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