Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)

the network requires a special hierarchical design
fast convergence of the network is crucial
the network is using a hub and spoke topology
the network is using a flat design
there are more than 15 hops between the most distant routers

ccna exploration 2 chapter 3 Exam Question And Answers 

Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)