图示直杆重量不计,两端分别以铰链与一可在光滑的水平、垂直滑槽内滑动的滑块A、B连接,若在直杆的中点C作用一力P>0。下列四图中,可使直杆处于平衡状态的是(  )。

A、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/153967750665885c263bd52c144d98f1b15ac3fb4436a.png" alt="上传图片">

B、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15396775180648e2868777ff64169a35fdf8006d92f81.png" alt="上传图片">

C、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1539677528455b9e62ae8c08a429bb0d3bfc3a3c15311.png" alt="上传图片">

D、<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/153967754061012877c2829914ee38cfc10d4314f7ed1.png" alt="上传图片">