(Choose 1 answer)
Choose the correct statement. (This question has no picture)
A. From the light source, draw light ray passing through point A, cut the plane (a) at point Ab. Point Ab is the shadow of point A on the plane (a)
B. From the light source, draw light ray passing through point A, cut the ground plane at point Ab. Point Ab is the shadow of point A on the plane (a)
C. From the light source, draw light ray passing through point A, cut the picture plane at point Ab. Point Ab is the shadow of point A on the plane (a)
