According to Kepler’s Third Law of Planetary Motion, the square of the orbital period T of a planet is directly proportional to the:A. Cube of the semi-major axis of its orbit (r³)B. Square of the semi-major axis of its orbit (r²)C. Semi-major axis of its orbit (r)D. Inverse square of the semi-major axis of its orbit (\(\frac{1}{r^{2}}\))