Four number triads have been given, out of which three are alike in some manner and one is different. Select the number triad that is different from the rest.

(326, 654, 981)

The logic followed here is:

option 1 

(273, 546, 819)

 2+ 7 + 3 = 12

 5 + 4 + 6 = 15

 8 + 1 + 9 = 18

option 2
(291, 438, 657)

2 + 9 + 1 = 12

4 + 3 + 8 = 15

6 + 5 + 7 = 18

option 3

(326, 654, 981)

3 + 2 + 6 = 11

6 + 5 + 4 = 15

9 + 8 + 1 = 18

option 4

(192, 384, 576)

1 + 9 + 2 = 12

3 + 8 + 4  = 15

5 + 7 + 6  = 18