Answer is UDLD
DCI: DataCenter Interconnect (not ACI - which is another Cisco product)
Dark Fiber: is the marketing term for a direct fiber cable dug in the ground between two DCs.
UDLD is Uni-directional Link Detection protocol that is used to detect if there is a problem with rx/tx in the fiber strands that may cause switching loop.
The answer is wrong.
The ACI fabric does not participate in the Spanning Tree Protocol. Instead, it implements the Mis-Cabling Protocol (MCP) to detect loops. MCP works in a complementary manner with STP that is running on external Layer 2 networks and handles bridge protocol data unit (BPDU) packets that access ports receive.
The answer is MCP
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