Ryan throws a tennis ball straight up into the air. The ball reaches its maximum height at 2 seconds. The approximate height of the ball $x$ seconds after being thrown is shown in the table.
Motion of Tennis Ball
\begin{tabular}{|c|c|}
\hline \begin{tabular}{c}
Time (seconds) \\
$x$
\end{tabular} & \begin{tabular}{c}
Height (feet) \\
$y$
\end{tabular} \\
\hline 0 & 4 \\
\hline 1 & 52 \\
\hline 2 & 68 \\
\hline 3 & 52 \\
\hline 4 & 4 \\
\hline
\end{tabular}

Which equation models the motion of the ball?
$y=-17(x)(x-4)$
$y=-16(x)(x-4)$
$y=-16(x-2)^2+68$
$y=-17(x-2)^2+68$