Which of the following sets of numbers could be the lengths of the sides of a triangle?
a. 3.5 cm, 7 cm, 10.5 cm
b. 3.5 cm, 7 cm, 14 cm
c. 3.5 cm, 3.5 cm, 3.5 cm
d. 3.5 cm, 5 cm, 10 cm