Answer:
[tex]\huge\boxed{\sf\: e \: -\: f \:\: and \:\: a \: -\: b}[/tex]
Explanation:
The car is not moving / is at rest from section(s) e to f & a to b.
Here, from e to f & a to b, we can see in the distance-time graph that the car shows no motion & is present in the same direction even though the time changes. Hence, we can infer that the car is at rest.
If the line goes up then the speed increases, if it's moving down then the speed decreases & if the line is the same then the car is at rest.
[tex]\rule{150}{2}[/tex]
