3751: A cube of side 2 units is placed in a rectangular coordinate system with its centre at the origin. The coordinates of a set of 4 non-adjacent corners is
(a) (1, 1, 1); (-1, -1, -1); (1, -1, -1);
(b) (1, 1, 1); (-1, 1, 1); (1, -1, 1); (1, 1, -1)
(c) (1, 1, 1); (-1, -1, -1); (-1, 1, 1); (1, -1,-1)
(d) (-1, -1, -1); (1, 1, -1);. (-1, 1, 1); (-1, 1, -1)