From SLIDE 3:
	1) The built-up roof (BUR) consists of
	A. A rubber material that is laid as one ply and typically 45-60 mils thick
	B. Alternating plies of bitumen and felts
	C. Polyurethane foam that is sprayed into place
	D. A system that has the insulation on top of the waterproofing membrane

Please click the correct answer to advance to the next question.