Which two requirements must an engineer verify about switch connectivity to solve the problem?

An engineer is troubleshooting a fabric discovery failure .

Which two requirements must an engineer verify about switch connectivity to solve the problem? (Choose two.)
A . A Cisco APIC must be attached to a spine node only.
B . A Cisco APIC must be attached to leaf nodes.
C . Spine nodes must connect to other spine nodes.
D . A Cisco APIC must be dual-attached to two separate spine nodes.
E . Leaf nodes must connect to spine nodes only.

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Answer: B,E