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
B . Merge all the areas into one backbone area
C . Tune OSPF parameters
D . Make all non-backbone areas stub areas
E . Span the same IP network across multiple areas.

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Answer: C,D