If ax 2 + bx + c = 0, is an identity in x, then

Correct Answer is : a = 0, b = 0, c = 0

x = {−\:b \pm \sqrt{b^{2}−4ac}\:}/{2a}

\text{c} = 0,x = \:\frac{−b}{a},\:x = \frac{b}{a}