Which of the following statements are true concerning the Sweep Heuristic for the Vehicle Routing Problem (VRP)?

a.The Sweep Heuristic will always provide the same solution regardless of the direction of the sweep (clockwise or counter clockwise) if started from the same position.

b.If N is the number of clusters in the network, then N vehicles will be used.

c.The Sweep Heuristic will always provide the same solution regardless of the starting position.

d.The sequence in which nodes are added into a cluster will be the final order of delivery.