Refer to the exhibit. The USER that is connecting an application on an Internet connection in AS 100 is facing these issues: - The USER lost the connection to the application during a failure…

Setting R4 as a route reflector for R3 and CE2 addresses iBGP full-mesh requirements but does not inherently create a preferred path or solve the specific redundancy issue for user connection outages caused by R2 failures.

Applying a high Local Preference on R3 toward R1 influences R3's outbound path selection, but the issue described pertains to the user's connection in AS 100 to an application behind CE2, primarily involving R4's path selection towards CE2.

Setting R3 as a route reflector for R4 and CE1 addresses iBGP full-mesh requirements, but it does not directly solve the problem of path preference for user traffic to CE2 or provide specific redundancy for R2's failure.

Applying a low Local Preference on R4 for routes learned from R2 will cause R4 to prefer alternative paths (e.g., through R1) that have a higher Local Preference value. This establishes a primary path through R1, providing redundancy and ensuring continuous connectivity to the application behind CE2 even if R2 experiences failures or configuration loss.