Option D is the most practical and efficient solution. XSIAM is a cloud-native platform, and while data residency is crucial, deploying multiple XSIAM tenants (B) for different regions adds significant management overhead and might fragment visibility. A single EU tenant (A) would violate data residency for non-EU data unless all data is specifically EU-based, and performance for other regions would suffer due to latency. Option C is incomplete and restrictive. Option E is not a standard XSIAM deployment model. By utilizing a single EU XSIAM tenant and configuring remote data collectors (like XDR agents or Prisma Access) to forward data directly to the EU Cortex Data Lake, all data resides in the EU, and performance for data ingestion is optimized by using XSIAM's global network of collection points without needing multiple tenants.