You must stop before meeting or overtaking a school bus loading or unloading passengers on a - roadway. On a - roadway where a bus is stopped in the opposite direction from which you are traveling, you are ___ required to stop your vehicle but you should drive with caution.
a) Two-lane, divided; four-lane, divided; not
b) Two-lane, undivided; two-lane, divided; not
c) Four-lane, divided; two-lane, undivided; required
d) Four-lane, undivided; four-lane, divided; required