对于 S7 — 200 PLC ，其定时器共有（    ）个。

A、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">125</span>

B、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">255</span>

C、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">256</span>

D、<span style="FONT-FAMILY: &#39;Times New Roman&#39;,&#39;serif&#39;; COLOR: black; FONT-SIZE: 14px">1024</span>