Hierarchical Routing AS3 other networks AS1 ASZ other networks Above figure shows three Autonomous Systems (ASS) attached to each other. Suppose that router 2b wants to send packets to 3b using BGP, and it learns two routes (one is over AS1 and the other is directly to AS3). a) (3 pts) Which gateway (2a or 2d) would router 2b forward packets if it selects the route based on shortest AS-PATH? Why? b) (3 pts) Which gateway (2a or 2d) would router 2b forward packets if it selects the route based on hot-potato routing? Why? c) (4 pts) Given that there are two different routes, is it possible that 2b learns just one route in the above network? Why?