What are the danger zones on the left side , right side as well as the rear of the bus ?
a. Left side danger zones: blind spots, potential for pedestrians or cyclists to be unseen
b. Right side danger zones: blind spots, potential for pedestrians or cyclists to be unseen
c. Rear danger zones: blind spots, potential for children or objects to be unseen
d. Rear danger zones: risk of being rear-ended by another vehicle