Final answer:
The driver departs the drop-off location after a headcount is conducted.
Step-by-step explanation:
The question pertains to the procedures followed by a driver at a drop-off location. The correct answer is b) After a headcount is conducted. This means that the driver waits until all the students exit the vehicle and conducts a headcount to ensure that all students have safely left the vehicle before departing the drop-off location.