Which two aspects are considered when designing a dual hub, dual DMVPN cloud topology? (Choose two.)

Which two aspects are considered when designing a dual hub, dual DMVPN cloud topology? (Choose two.)
A . recommended for high availability
B . requires all sites to have dual Internet connections
C . spoke-to-spoke traffic will transit the hub unless spokes exchange dynamic routing directly
D . hub sites must connect to both DMVPN clouds
E . will only work with single-tier headend architecture

Answer: A,E