Which of the following statements regarding intumescent and mastic coatings is MOST accurate?

A) The charring that occurs when intumescent coatings are exposed to the heat of a fire acts as the insulating material for the steel.
B) Intumescent coatings are applied in a thickness greater than the thickness of SFRMs.
C) Both mastic and intumescent coatings are more visually appealing and less expensive than SFRMs.
D) Mastic coatings have a more complex reaction to the heat of a fire than intumescent coatings.

D