Given two functions, \(f(x)\) and \(g(x)\), which pair of function definitions would make \(f(g(x))=g(f(x))\) true?
\(f(x)=\frac{x}{3}\) and \(g(x) = 3x\)
\(f(x)=\sqrt{x} + 2\) and \(g(x) = x^2 -2\)
\(f(x)=2x+5\) and \(g(x) = 2x-5\)
\(f(x)=x+9\) and \(g(x) = \frac{1}{2}x-18\)
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