If f is a differentiable function such that f′(x) = (x^2− 16)*g(x), where g(x)>0 for all x, at which value(s) of x does f have a local maximum?
1. At both x=-4,4
2. Only at x=-16
3. Only at x=4
4. At both x=-16,16
5. Only at x=-4
6. Only at x=16
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