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.
