What is the minimum distance you can store materials relative to sprinkler heads?
A. 18 inches (45.72 cm) in all directions
B. 28 inches (71.12 cm) in all directions
C. 18 inches (45.72 cm) if the sprinklers are on the ceiling; 28 inches (71.12 cm) if the sprinklers are on the walls
D. 28 inches (71.12 cm) if the sprinklers are on the ceiling; 18 inches (45.72 cm) if the sprinklers are on the walls
