The co-efficients of the quadratic equation ax2 + bx + c = 0 are the three consecutive terms of a G.P in that order. The product of the roots of that equation is 9. What is the relation between the coefficients?

1) a = 9 (b-2c)
2) b = 9 (c-a)
3) b = 9 (3a-c)
4) a = 9 (2c-b)
5) c = 9 (b-2a)