A. all drivers should yield the right-of-way to public transit buses traveling in the same direction which have signaled and are reentering the traffic flow from a specifically designated pullout bay. b. all drivers should yield the right-of-way to public transit buses traveling in the opposite direction which have signaled and are reentering the traffic flow from a specifically designated pullout bay. c. all drivers must yield the right-of-way to public transit buses traveling in the same direction only if the bus has signaled and is reentering the traffic flow from a specifically designated school loading zone. d. all of the above