A.AH=01,AL=05 B.AH=1,AL=15 C.AH=0,AL=0FH D.AH=0,AL=05
A.MOV AX,BX B.MOV BX,AX C.PUSH AX POP BX D.MOV CX,AX MOV AX,BX MOV BX,CX
A.AND B.NEG C.NOT D.INC