Which of the following possibilities will form a triangle?

a. side = 15 cm, side = 7 cm, side = 7 cm
b. side = 15 cm, side = 7 cm, side = 9 cm
c. side = 14 cm, side = 6 cm, side = 7 cm
d. side = 14 cm, side = 6 cm, side = 8 cm