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Math·Advanced Math·Nonlinear functions

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The function $f(x)=\frac{1}{9}(x-6{)}^2+3$ gives a toy car’s height above the ground $f(x)$, in inches, $x$ seconds after it started moving on an elevated track, where $0\le x\le 10$. Which of the following is the best interpretation of the vertex of the graph of $y=f(x)$ in the $xy$-plane?

A

The toy car’s minimum height was $3$ inches above the ground.

B

The toy car’s minimum height was $6$ inches above the ground.

C

The toy car’s height was $3$ inches above the ground when it started moving.

D

The toy car’s height was $6$ inches above the ground when it started moving.