Question $5$: Below is a plan view of a $4-$point lift $($meaning$,$ there is a padeye at each of the $4$ corners, and a sling goes from each corner to the hook of the crane$).$ Assume all slings at the hook converge to a single point, with the hook located directly over the CoG. The minimum angle allowed of any sling, measured from the horizontal is $60$ degrees. Please answer:

a$.$ What is the length of the shortest sling

b$.$ What is the sling angle of the shortest sling

c$.$ What would happen if the hook was NOT over the CoG when the structure was lifted?