A frog sitting on a stump 4 feet high hops off and lands on the ground. During her leap, the frog's height h in feet is given by the equation h = -0.5d² + d +4, where d is the horizontal distance in feet from the base of the stump.

A: What was the frog's maximum height?

B: How far from the stump did the frog land?

C: What was the frog's horizontal distance from the log at her maximum height?