Problem $1(30$ pts $)$ For the structure shown below, use force method to

a$.$ Determine reactions at point $A,B,$ and $D.(10$ points$)$

b$.$ Draw shear diagram for the frame. $(10$ points$)$

c$.$ Draw moment diagram for the frame. $(10$ points$)$

Note: $E=200$GPa,$I=25000c{m}^4$