What is the minimum clearance between the bottom of the seat and the protective surfacing for a Multi-Axis Swing?

The minimum clearance between the bottom of the seat and the protective surfacing for a Multi-Axis Swing is 12 inches. This is because any lower than 12 inches can increase the risk of injury if a child's feet were to get caught underneath the swing or if they were to fall off the swing. Option A is too close to the ground and increases the risk of injury, while option C and D are too far away which could cause difficulty accessing the swing.