Which graph could represent a car that begins by increasing its speed, then travels at a constant speed, and then decreases its speed, as time increases?

Alright, to start this question we can begin by visualizing the speed of the car as it goes through the equation. If the car increases its speed, the graph should mirror that, which can be shown by a positive slope (like this / ). When the car maintains its speed, the slope of the graph should be horizontal for as long as the car isn't speeding up or slowing down (like this - ), and when the car begins to slow down, the graph's slope should change to a negative one (like this / )