在西门子 S7-200 指令中，下列指令哪项是字节取反指令 （  ）

A、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">ANDB</span>

B、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">ORB&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">XORB</span>

D、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">INVB</span>