Which question is not answered by the Article?

What did Leonardo use to help him reach different parts of the wall in the Council Hall?
Why did Michelangelo's work on the battle painting never get beyond the sketch stage?
Why did the government of Florence choose both artists to paint the Council Hall?
What did Michelangelo insult Leonardo about when they met in the streets of Florence?

What did Leonardo use to help him reach different parts of the wall in the Council Hall?