You are traveling in the right lane of a four-lane highway. You see an emergency vehicle pulled over ahead, its lights flashing. What must you do?
a. Leave an empty lane between your vehicle and the emergency vehicle if possible; if not, slow down. Proceed with caution.
b. Leave an empty lane between your vehicle and the emergency vehicle only when the speed limit exceeds 40 mph; otherwise, slow down. Proceed with caution.
c. Slow down. Leave an empty lane between your vehicle and the emergency vehicle if possible. Proceed with caution.
d. Proceed with caution.