Suppose A, B, C are defined as A = a2b + ab2 – a2c – ac2 , B = b2c + bc2 – a2b – ab2 and C = a2c + c2a – cb2 – c2b, where a > b > c > 0 and the equation Ax2 + Bx + C = 0 has equal roots then 1/a, 1/b, 1/c are in
(a) A.P
(b) G.P
(c) H.P
(d) None of these