A $3$D shaft structure with solid cross$-$sections is rigidly attached to a wall as shown below. A force $2$ P acts along the negative z $-$direction at the top of the structure. Another force P acts along the negative y$-$direction on the structure. Each shaft has a length L$,$ and the horizontal shaft has a diameter of d $.$

a$)$ Find the internal reactions close to the wall, a distance L from the bend in the pipe structure.

b$)$ Draw stress distributions due to the reactions on the given cross$-$sections below.

c$)$ Fill out the provided chart below with the stress components caused by the loadings on the system at points A and B$.$ Answers should be in terms of L$,$ d$,$ and P$.$

d$)$ Draw the stress components present at points A and B on the provided stress elements.

Please provide finalized answers with work.