The graph models the height of a diver above water, in feet, x seconds after jumping off a springboard. What does the x-intercept represent? 
 The diver reached the maximum jump height after 2 s. 
 The springboard was 2 ft above the surface of the water. 
 The diver jumped 2 ft above the springboard. 
 The diver was in the air for 2 s.