Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)

Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)
A . aggregate routing information on an OSPF ABR
B . fully meshed distribution layer
C . Equal-Cost Multipath routing
D . EIGRP query boundaries
E . multiple IS-IS flooding domains
F . tuned Spanning Tree Protocol timers

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Answer: A,D,E