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If the function f(x) = x^3 + 3(1-7)x^2 ...

If the function ` f(x) = x^3 + 3(1-7)x^2 +3(a^2-9)x-1 ` has a positive point Maximum , then

A

`a in (3,oo)cup(-oo,-3)`

B

`a in (-oo,-3)cup(3,29//7)`

C

`(-oo,7)`

D

`(-oo,29)`

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The correct Answer is:
B
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