Which of the following statements about railroad crossings is true?

You must stop at a railroad crossing when directed to do so by a flagger, stop sign, or warning devices, such as gates or flashing lights. Not all railroad crossings are equipped with such devices. It is against the law to drive around lowered railroad crossing gates.

• It is against the law to go around lowered gates at a crossing.
• You must stop at a railroad crossing when directed to do so by a flagger.
• Not all railroad crossings are equipped with flashing red signals and gates.
• All of the above.