what is length?

[Cute]

Which of the sets of numbers can be used as the lengths of the sides of a triangle?

I. [5,7,12]
II. [2,4,10]
III. [5,7,9]

A. I only
B. III only
C. I and II only
D. I and III only
E. II and III only

[metodiev]

B - use the rule of the triangle

[GMAT730]

Can you post the tringle rules?
Thanks

[lego2401]

For any side of a triangle. its length must be greater than the difference between the other two sides, but less than the sum of the other two sides.