You are considering prototypes for your new disco$-$donkey $($whom you will name Fritz$).$ Which configuration$($s$)$ of the three listed below would be stable under their own weight, given that your miniature prototype was on the verge of collapse $($mass $=10$ kg $,$ with $4$ legs of diameter $1\mathrm{.}0$ cm $)?$

$\backslash$table$[[$Prototype $1,$Prototype $2,$Prototype $3],[M=100kg,M=90kg,M=50kg$ Can you please explain how D is the answer and how they got that?