Question 10: Consider a packet-switching network for server communications with n nodes. For each of the following topologies, sketch the network, and give the average number of hops between a pair of servers (include the server-to-node link as a hop).

(a) Star: one central node with all servers attached to the central node

(b) Bidirectional ring: each node connects to two other nodes to form a loop, with each node connected to one server

(c) Fully connected: each node is directly connected to all other nodes, with each node connected to one server

(d) A ring with n 1 nodes connected to a central node, with each node in the ring connected to one server

please with explain