The correct answer is: B. Train Protection Warning System.
TPWS stands for Train Protection Warning System. It is a safety system used on Indian Railways to prevent train collisions. The system uses track circuits to detect the presence of trains, and if a train is approaching a red signal at excessive speed, the system will activate the train’s brakes to bring it to a stop.
Option A, Train Passenger Warning System, is incorrect because it does not accurately describe the purpose of TPWS. TPWS is not designed to warn passengers, but to prevent train collisions.
Option C, Train Protection Warning Stopper, is incorrect because it is not a common term used to describe TPWS. The more common term is Train Protection Warning System.
Option D, Transmission Protection warning Stopper, is incorrect because it does not accurately describe the purpose of TPWS. TPWS is not designed to protect transmissions, but to prevent train collisions.