What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)

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What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)
A . Use structured hierarchical topology with route summarization
B . Used sub-second timers
C . Use the distribute-list command to filter routes
D . Modify delay parameters on the links
E . Implement multiple EIGRP autonomous systems

Answer: A,E