The school bus always stops at the railroad tracks. When the warning light is not flashing, it then proceeds directly across if the tracks are clear. However, when thewarning light is not flashing and the tracks are not clear, the school bus waits until theyarc clear and then proceeds immediately across them If the statements above are true and it is true that the school bus stops at the tracks and then does not proceed to cross then. Which of the following must also be true?