Kepler’s law of planetary motion states that the square

Kepler’s law of planetary motion states that the square of the time period is proportional to the

1. semi-major axis
2. square of the semi-major axis
3. cube of the semi-major axis
4. fourth power of the semi-major axis

Kepler’s law of planetary motion states that the square of the time period is proportional to the cube of the semi-major axis.