A prosthetic knee joint is designed to support a maximum load of $1,200N($considering body weight and dynamic forces during movement$).$ The knee joint has a cross$-$sectional area of $150m{m}^2.$ The material used for the knee joint has a yield strength of $250$ MPa $.$ The design includes a factor of safety of $2$ to ensure the joint can handle unexpected loads. Calculate:

a$)$ The stress experienced by the knee joint under maximuin load.

b$)$ The allowable stress for the knee joint considering the factor of safety.

c$)$ Determine if the knee joint can safely withstand the maximum load.