Problem $1.(20$ points$)$ Complete each free$-$body diagram. Make sure to include the correct directions for all forces. In each of the five following examples, an object is shown on the left hand diagram, and an outline of the object of interest is shown on the right. The weights of the bodies are negligible unless otherwise indicated. Dimensions and numerical values are omitted for simplicity. $5$ pts each.

A$.$ A bridge truss supported by a pin $($left$)$ and roller resting on an incline $($right$).$

B$.$ The L$-$shaped bracket A$-$B

C$.$ Pipe B$.$ Both pipes have significant mass.

D$.$ The upper half of a pair of pliers squeezing a bolt.