discrete math please help c$.$ Find a circuit that is not a cycle at vertex $v_4.$

Refer to the figure below.

a$.$ Find a closed path of length $9$ at $v_5.$

b$.$ List all the vertices that are not reachable from any other vertex.

c$.$ Find circuits of lengths $4,5,$ and $6$ at $v_3.$

d$.$ Which of the circuits found in part $($c$)$ are also cycles?