Melissa and Robbie are flying remote control gliders. The altitude of Melissa's glider, , in feet, is modeled by this function, where s is time, in seconds, after launch. The altitude of Robbie's glider is modeled by function r, where s is time, in seconds, after launch. Which glider reaches the greater maximum altitude in the first 6 seconds after launch? A. Melissa's glider B. Robbie's glider C. Neither glider reaches a maximum altitude on the given interval. D. Both gliders reach the same altitude on the given interval.