Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

A. Use Bidirectional Forwarding Detection Most Voted B. Merge all the areas into one backbone area C. Tune OSPF parameters Most Voted D. Make all non-backbone areas stub areas E. Span the same IP network across multiple areas.