Which description regarding the initial APIC cluster discovery process is true? 

Answer options:

A. The APIC uses an internal IP address from a pool to communicate with the nodes.
B. Every switch is assigned a unique AV by the APIC.C. The APIC discovers the IP address of the other APIC controllers by using Cisco Discovery Protocol.
D. The ACI fabric is discovered starting with the spine switches.

C

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/aci-fundamentals/b_ACI-Fundamentals/b_ACI- Fundamentals_chapter_010011.html