According to the news item, what are robots supposed to do in the trial？A．Replace wardens

According to the news item, what are robots supposed to do in the trial？

A．Replace wardens to do the daily work in prison.

B．Identify prisoners" abnormal behaviors promptly.

C．Ensure all prisoners act normally.

D．Guard against prison break.

请帮忙给出正确答案和分析，谢谢！