Which of the following are bases for mathbb{R}³ ?

(a) (1, 2, 0) and (0, 1, -1)

(b) (1, 1, -1) , (2, 3, 4) , (4, 1, -1) , (0, 1, -1)

(c) (1, 2, 2) , (-1, 2, 1) , (0, 8, 0)

(d) (1, 2, 2) , (-1, 2, 1) , (0, 8, 6)