The values of a and b, for which the system of equations
2x + 3y +6x = 8
x + 2y + az = 5
3x + 5y + 9z = b

has no solution are :
(1) a = 3, b ≠13
(2) a ≠ 3, b = 13
(3) a = 3, b = 13
(4) a = 3, b = 13