Select all the sets of lengths that could represent the sides of a right triangle.

6 cm, 7 cm, 8 cm
7 in., 15 in., 11 in.
9 m, 12 m, 14 m
3 ft, 4 ft, 5 ft
3 mm, 9 mm, 90−−√mm

3 ft, 4 ft, 5 ft