Which two headend router scalability factors should be considered when designing a DMVPN network solution that uses a hub-and-spoke topology?

Which two headend router scalability factors should be considered when designing a DMVPN
network solution that uses a hub-and-spoke topology? (Choose two.)

A.
the required aggregated packet per second
–

B.
the amount of bandwidth necessary to terminate all the remote tunnels

C.
the routing protocol chosen for the data plane routing

D.
the maximum number of tunnels supported by the headend router

E.
the CPU and memory of the headend router