What Should a Firefighter Do Before Stepping Off a Ladder

What should a firefighter do before stepping off a ladder, parapet wall, or other place of safety onto the roof of a burning building, especially if the roof surface is obscured by smoke or darkness?

A) Ensure the safety of all personnel who are assisting.
B) Direct a fire stream into an existing vertical exhaust opening.
C) Sound the roof for structural integrity by striking with an axe.
D) Direct a fire steam into an existing horizontal exhaust opening.