How should you act when a "Stop" sign is posted before a railway crossing?

1. AStop as is customary at any place where a "Stop" sign is posted, and continue driving.
2. BYou are required to stop only if a train is approaching, is seen or is heard.
3. CAt night it is obligatory to stop. During the day – no.
4. DStop your vehicle, switch off the radio or television receiver or the cassette and open the vehicle window closest to you.

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