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