Question.6. If -5+iβ,-5+iγ, β2!=γ2,β,γ∈R are roots of x3+15x2+cx+860=0, c∈R then ( Roots of Equation )

(A) c=222

(B) all the three roots are imaginary

(C) two roots are imaginary but not complex conjugate of each other.

(D) -5+7sqrt(3)i, -5-7sqrt(3)i are imaginary roots.