$[4](25$ points$)$ For the truss and loading shown:

a$)$ Identify all zero$-$force members $($show on figure$).$

b$)$ Using method of joints, determine the force in members $FG$ and $GH.$

c$)$ Using method of sections, determine the force in members $JK,CJ$ and $CD.$

$**$Be sure to indicate if members are in tension $(T)$ or compression $(C{)}^{****}$