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

If `alpha,beta,gamma,delta` are the roots of the equation `x^4+4x^3-6x^2+7x-9=0,` then he 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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