Which of the following algorithms is not a broadcast routing algorithm?

Explanation

Note: Flooding, multi-destination routing and reverse path forwarding are all broadcast routing algorithms, so none of them is 'not' a broadcast routing algorithm; the book keys (d). Flooding generates too many packets and consumes too much bandwidth but can be used for broadcasting. In multi-destination routing each packet contains a list of destinations, and reverse path forwarding approximates spanning-tree broadcast even when routers know nothing about the spanning tree.