Two planets \( A \) and \( B \) of equal mass are having their period of revolutions \( T_{A} \) and \( T_{B} \) such that \( T_{A}=2T_{B} \). These planets are revolving in the circular orbits of radii \( r_{A} \) and \( r_{B} \) respectively. Which out of the following would be the correct relationship of their orbits?
