A. Use AWS Database Migration Service (AWS DMS) to migrate the DB instance from the source AWS account to the destination AWS account.
B. Create a DB snapshot of the DB instance. Share the snapshot with the destination AWS account. Create a new DB instance by restoring the snapshot in the destination AWS account.
C. Create a Multi-AZ deployment for the DB instance. Create a read replica for the DB instance in the source AWS account. Use the read replica to replicate the data into the DB instance in the destination AWS account.
D. Use AWS DataSync to back up the DB instance in the source AWS account. Use AWS Resource Access Manager (AWS RAM) to restore the backup in the destination AWS account.