Provide a MCNF instance with 4 nodes. Provide the network and all the associated data pertaining to b,c and u values. a) Provide a flow vector x that is feasible but not basic, use at most 4 arcs for the network. b) Provide a flow vector x that is basic but not feasible where the network is a spanning tree. c) Provide a flow vector x that is basic and feasible, use 5 arcs for the network. d) Provide a bfs which is degenerate.