$(45$ points total$)$ For the beam shown below:

a$)(5$ points$)$ Determine the reaction force, $R_1,$ at the support B $.$

b$)(5$ points$)$ Determine the reaction force, $R_2,$ at the support C $.$

c$)(10$ points$)$ Determine the maximum tensile bending stress.

d$)(10$ points$)$ Determine the maximum compressive bending stress.

e$)(5$ points$)$ Determine the maximum shear stress due to $V.$

f$)(10$ points$)$ Determine the maximum shear stress in the beam.