A financial services company runs a legacy monolithic application on-premises backed by a licensed commercial relational database with a strict per-core licensing agreement. Leadership wants to migrate to Google Cloud within six months to reduce data-center costs, but the application team lacks the capacity to refactor the application before the deadline. Compliance requires the database engine and version to remain identical during the initial migration to avoid recertification. Which migration approach best meets these business and technical requirements for the first phase?