The real function f(x)=2x^3 - 3x^2 - 36x...

The real function `f(x)=2x^3 - 3x^2 - 36x +7` is:
a. Strictly increasing in `(-infty,-2)` and strictly decreasing in `(-2,infty)`
b. Strictly decreasing in `(-2,3)`
c. Strictly decreasing in `(-infty,3)` and strictly increasing in `(3,infty)`
d. Strictly decreasing in `(-infty,-2)U(3,infty)`

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