If alpha,beta,gamma,sigma are the roots ...

If `alpha,beta,gamma,sigma` are the roots of the equation `x^4+4x^3-6x^2+7x-9=0,` then the value of `(1+alpha^2)(1+beta^2)(1+gamma^2)(1+sigma^2)` is

A

9

B

11

C

13

D

5

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The correct Answer is:

C

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