A PostgreSQL-compatible database must run in the customer's own infrastructure or another supported environment rather than only as a Google-managed cloud instance. Which approach best fits?

1. Evaluate AlloyDB for PostgreSQL.
2. Use an appropriate Memorystore cache with explicit expiry and consistency behavior.
3. Retain a compatible relational model unless the application and access patterns are redesigned.
4. Evaluate AlloyDB Omni and its supported deployment requirements.