2. Consider the directed graph G = (V,E) below with non-negative capacities c : E R20 and an (s, t)-flow f : E R20 that is feasible with respect to c. Each edge is labeled with its flow/capacity. 5/5 5/20 o/15 o/10 o/10 5/15 o/10 5/15 5/5 An (s, t)-flow f. Each edge is labeled with its flow/capacity. (a) Draw the residual graph Gf - (V,Ef) for flow f. Be sure to label every edge of G with its residual capacity (b) Describe an augmenting path s = Vo-w1...-w.-t in Gf by either drawing the path in your residual graph or listing the path's vertices in order