DataWise Solutions is migrating a critical Amazon RDS for Oracle database to an RDS for PostgreSQL instance in a separate AWS account to improve scalability and reduce licensing costs. The solutions architect must design a zero-downtime migration strategy that replicates all existing and new data while minimizing the migration duration, considering applications use a Route 53 CNAME record and the Oracle database resides in a private subnet. Which combination of steps should the solutions architect take to meet these requirements? (Choose three.)