22. if the motion of planet (of mass m) around sun (of mass m) is treated as a two body problem, t the period of revolution, a, the semimajor axis and g the gra

22. If the motion of planet (of mass m) around sun (of mass M) is treated as a two body problem, T the period of revolution, a, the semimajor axis and G the gravitational constant, then the exact form of the third law of Kepler is 4T T (A) GM (B) 4r GMm 47 C) G(M+m) (D) T4r (M+m) a GMm