Which TWO statements about roof sketching methods are true?
A . A roof footprint sketch must be a closed loop
B . You set the start and end points of a roof to determine the depth of the extrusion
C . You can draw a footprint by sketching the profile of the top of the roof in an elevation or section view
D . A roof footprint is a 3D sketch of the perimeter of a roof
Answer: A,B