An adventurous cliff jumper runs horizontally off a cliff at time t=0t=0t, equals, 0. We can ignore air resistance. A grey cliff ledge is shown on the left side of the image with blue water below it and across the bottom of the screen. A brown stick-figure person is running on the cliff towards the right. On the right side is a small grey coordinate axis showing up and right as positive directions.

Which graph best describes the cliff jumper’s vertical acceleration over time?
Assume the origin of the coordinate system to be the cliff edge.