If alpha,beta,gamma be the roots of ax^(...

If `alpha,beta,gamma` be the roots of `ax^(3)+bx^(2)+cx+d=0`. If `S_(1)=0` (where `S_1` is sum of roots taken one at a time), then
(A) b = 0
(B) a = 0
(C) `alpha+beta+gamma = 0`
(D) None of these

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