Which combination of actions must a solutions architect take to meet these requirements?

Explanations:

Creating an ongoing replication task allows for real-time data replication from the on-premises PostgreSQL database to the Amazon Aurora PostgreSQL database, ensuring that both remain synchronized during the migration process.

Creating a database backup of the on-premises database does not support the requirement for real-time synchronization, as it only captures a snapshot of the database at a specific point in time and does not maintain ongoing access or synchronization.

Setting up an AWS Database Migration Service (AWS DMS) replication server is necessary for managing the replication tasks between the on-premises database and the Aurora database, facilitating continuous synchronization.

While converting the database schema using the AWS Schema Conversion Tool (AWS SCT) may be necessary for initial setup, it does not address the requirement of keeping the databases synchronized during the migration.

Creating an Amazon EventBridge (Amazon CloudWatch Events) rule to monitor database synchronization does not directly facilitate synchronization. It may be useful for monitoring but does not perform the required actions for real-time data replication.