When a passenger ‘s cash was returned by the TVM repeatedly, what should a station officer do?

A、A station officer should check whether the passenger’s operation procedure is correct and help the passenger buy tickets.;
B、A station officer should guide the passenger to buy tickets on other machines when he or she confirms the TVM is broken.;
C、A station officer may advise the passenger to pay for the journey by mobile App via Bluetooth.;
D、A station officer may advise the passenger to buy tickets by weChat or Alipay on the TVM.