Find the dimensions of a closed rectangular box with a square base and volume 343 in³ that can be constructed with the least amount of material. What are the dimensions of the box? The length of one.

a) 7 inches by 7 inches by 7 inches
b) 14 inches by 7 inches by 7 inches
c) 7 inches by 7 inches by 14 inches
d) 49 inches by 7 inches by 1 inches