Which three statements accurately describe OSPF route summarization? (Choose three.)

Which three statements accurately describe OSPF route summarization? (Choose three.)
A . OSPF routes can be summarized at any OSPF router in the network using area range or summary address commands.
B . OSPF internal routes can be summarized only at the ABRs.
C . OSPF type 5 external routes can be summarized only at the ASBRs.
D . Route summarization can lead to a more stable network.
E . OSPF internal routes are automatically summarized via type 3 summary LSAs.
F . A flat addressing scheme is required in order to summarize OSPF routes.

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Answer: BCD