The value of a for which all extremum of...

The value of `a` for which all extremum of function `f(x)=x^(3)-3ax^(2)+3(a^(2)-1)x+1` lie in the interval `(2,4)`
1) `(3,4)`
2) `(-1,3)`
3) `(-3,-1)`
4) none of these

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