Suppose a, b, c are real numbers, and each of the equations x2 + 2ax + b2 = 0 and x2 + 2bx + c2 = 0 has two distinct real roots. Then the equation x2 + 2cx + a2 =0 has–
(A) Two distinct positive real roots
(B) Two equal roots
(C) One positive and one negative root
(D) No real roots