The graph of a function y=g(x) is shown ...

The graph of a function `y=g(x)` is shown in the following figure. If `f(x)=-3x^2-k x-12 ,k in Ra n df(g(x))>0AAx in R` then least integral value of `k` is equal to a. 13 b.64 c. 15 d.16

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