Classify each structure shown below as statically determinate or statically indeterminate. Also, specify if the structure is stable or unstable. Explain your reasoning. If statically indeterminate, specify the degree of statically indeterminacy. Consider all structures to be planar $($i$.$e$.2-$D$)$ and movements in the out$-$of$-$plane direction are prevented.

$($b$)$ Truss

Dots in beams$/$frame represent hinges.

Dots in trusses represent joints.