The function f(x)=71(x−6)2+4 gives a toy car's height above the ground f(x), in inches, x seconds after it started moving on an elevated track, where 0≤x≤10. Which of the following is the best interpretation of the vertex of the graph of y=f(x) in the xy-plane?
The toy car's minimum height was 4 inches above the ground.
A
The toy car's minimum height was 6 inches above the ground.
B
The toy car's height was 4 inches above the ground when it started moving.
C
The toy car's height was 6 inches above the ground when it started moving.