I am having problems with this mechanical engineering design question, any help?

A compression spring is made of 0.125-in steel wire, for which the shear stiffness G is 11.4 Msi, and shear yield stress Ssy is 85 ksi. It has closed and ground ends (i.e. 2 end coils). The coil's outer diameter is 1.25 in, and it has 11.25 total coils. If the spring has afree length Lo = 2.9 in, what is the safety factor against yield when the spring is compressed solid?FigureMinimize File PreviewZOOM +O 130 4.80 21O 0.84None of the above