[单选题]

若(AX)=0122H,四个标志位CF、SF、ZF、OF的初始状态为0,执行指令SUB AX, 0FFFH后,这四个标志位的状态是______。

A.(CF)=O,(SF)=0,(ZF)=0,(OF)=0

B.(CF)=1, (SF)=1, (ZF)=0, (OF)=0

C.(CF)=0, (SF)=0, (ZF)=1, (OF)=1

D.(CF)=1, (SF)=1, (ZF)=1, (OF)=1

参考答案与解析:

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若(AX)=0122H,四个标志位CF、SF、ZF、OF的初始状态为0,执行指令