17.48: In the binary star system shown, the
gidp;x fk ;f* r,rr)3ltwo stars follow circular orbits about the system’s center of mass. The stars are sepa
;rrl fif*k )dr;3gx,p rated by a distance D that is large compared to their size and are subject only to their mutual gravitational attraction. The orbital period of the star of mass M is T. Which one of the following choices represents the total mass of the binary star system?