Which of these triples is a primitive Pythagorean triple?
(20,21,29)(20, 21, 29)(20,21,29)
(6,8,10)(6, 8, 10)(6,8,10)
(9,12,15)(9, 12, 15)(9,12,15)
(10,24,26)(10, 24, 26)(10,24,26)