Refer to the exhibit. An architect must design a solution to connect the network behind R3 with the EIGRP network. Which mechanism should be included to avoid routing loops?

The 'down bit' is a specific OSPF mechanism for inter-area route summarization loop prevention, not a general EIGRP redistribution loop prevention mechanism.

Split horizon is an internal loop prevention mechanism within distance-vector protocols like EIGRP, preventing routes from being advertised back out the interface they were learned on, and does not address redistribution loops.

Route tags are custom identifiers attached to routes when they are redistributed between different routing protocols. EIGRP can then be configured with route maps to filter incoming routes based on these tags, preventing a route from being re-injected into its original protocol domain after redistribution, thus avoiding loops.

Summarization aggregates routes to reduce table size and improve stability, but it is not a direct mechanism for preventing routing loops during redistribution between different routing protocols.