The correct answer is: A. DOM
DOM stands for Driver Onboard Man Machine Interface. It is a system that provides the driver with information about the train’s status, such as speed, location, and the number of passengers. It also allows the driver to communicate with the train’s control center.
In one train only system, information of lost of metal token is given to DOM. This is because DOM is the only system that has access to the train’s data. When a metal token is lost, the driver will notify DOM. DOM will then update the train’s data and notify the control center.
The other options are incorrect because they are not systems that have access to the train’s data. AOM stands for Automatic Operation Mode. It is a system that controls the train’s speed and direction. DRM stands for Digital Radio Mondiale. It is a system that provides the train with communication and entertainment services.