Which two statements about Cisco ACI interaction with STP in legacy networks are true? (Choose two)

Which two statements about Cisco ACI interaction with STP in legacy networks are true? (Choose two)
A . External switches ignore flooded BPDU frames received from the Cisco ACIfabric.
B . BPDU guard is enabled on FEX ports by default.
C . BPDU guard cannot be configured on leaf edge ports.
D . STP is enabled by default within the Cisco ACIfabric.
E . BPDU frame is flooded within EPG No configuration is required.

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Answer: A,D