When there are many passengers waiting out of the ticket booth to buy tickets with cash, what should a station officer do?

A、A station officer may take the money and buy the ticket for the passengers on the TVM.;
B、A station officer may guide the passengers to go across the hall and buy tickets at another ticket booth.;
C、A station officer should maintain the order of the line and tell everyone to wait patiently.;
D、A station officer may advise the passengers holding cash to buy ticket on the TVM with 5 yuan or 10 yuan.