OSPF will be used as the IGP within a campus network. Which two things should you consider before deployment? (Choose two.)

OSPF will be used as the IGP within a campus network. Which two things should you consider before deployment? (Choose two.)
A . All areas need to connect back to area 0.
B . The OSPF process number on each router should match.
C . NSSA areas should be used when an area cannot connect directly to area 0.
D . Stub areas should be connected together using virtual links.
E . ECMP may cause undesired results depending on the environment.

Answer: A,E