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A quadratic function has roots at \(x=0\) and \(x=4\). Its graph is concave up. Which of the following could be its equation?

\(f(x) = -x(x-4)\)
\(f(x) = x(x+4)\)
\(f(x) = 3x(x-4)\)
\(f(x) = -2x(x+4)\)