From a design perspective which two of the following OSPF statements are most relevant? (Choose two)

From a design perspective which two of the following OSPF statements are most relevant? (Choose two)
A . OSPF stub areas can be thought of as a simple form of summarization
B . OSPF cannot filter intra-area routes
C . An ABR can only exist in two areas – the backbone and one adjacent area
D . Performance issues in the Backbone area can be offset by allowing some traffic to transit a non-backbone area
E . The size of an area (the LSDB) will be constrained by the size of the IP MTU

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Answer: AB