Your kid sister is making a mobile representing the earth, moon, and sun for her grade schoolscience fair. The ruler is provided below to help you determine positions of the three hangingballs, of mass 15 g, 5 g, and 30 g, respectively. Of the five options provided, where is thehorizontal center of mass at which would youconnect a string to this mobile so that it wouldremain balanced when you hung it from the string?(The rods and strings all have negligiblemass compared to the balls.)