For the frame shown below, assume that EI is constant. $(\backslash ($ A$-$B: E $\backslash$mathrm$\{$EI$\}$ ; B$-$D: $2\backslash$mathrm$\{$EI$\})\backslash )$

a$)$ Specify whether this structure is statically determinate or statically indeterminate. If statically indeterminate, determine the degree of indeterminacy.

b$)$ Use the force method to determine the reactions at supports $\backslash ($ A $\backslash )$ and $\backslash ($ C $\backslash ).$

c$)$ Draw the bending moment diagram for this structure.