A is corect
The predefined topologies based on which ACI forwards multi-destination traffic are called forwarding tag (FTag) trees. Each FTag tree does not necessarily use all fabric uplinks. That is why ACI creates multiple FTag trees and load balances multi-destination traffic across them. All switches in a fabric understand based on the FTag bits in the GIPo address how to forward the traffic they receive further along the specified FTag tree. Four bits are used to identify FTag IDs; ACI fabrics support up to 12 FTag trees.
A is correct
The ACI fabric uses Forwarding Tag (FTAG) trees to load balance multi-destination traffic. All multi-destination traffic is forwarded in the form of encapsulated IP multicast traffic within the fabric. The ingress leaf assigns an FTAG to the traffic when forwarding it to the spine. The FTAG is assigned in the packet as part of the destination multicast address. In the fabric, the traffic is forwarded along the specified FTAG tree. Spine and any intermediate leaf switches forward traffic based on the FTAG ID. One forwarding tree is built per FTAG ID. Between any two nodes, only one link forwards per FTAG. Because of the use of multiple FTAGs, parallel links can be used with each FTAG choosing a different link for forwarding. The larger the number of FTAG trees in the fabric means the better the load balancing potential is. The ACI fabric supports up to 12 FTAGs.
The ACI fabric uses Forwarding Tag (FTAG) trees to load balance multi-destination traffic. All multi-destination traffic is forwarded in the form of encapsulated IP multicast traffic within the fabric. The ingress leaf assigns an FTAG to the traffic when forwarding it to the spine. The FTAG is assigned in the packet as part of the destination multicast address. In the fabric, the traffic is forwarded along the specified FTAG tree. Spine and any intermediate leaf switches forward traffic based on the FTAG ID
https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/aci-fundamentals/cisco-aci-fundamentals-52x/fundamentals-52x.html
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