Correct answer - "Create a cron event in CloudWatch, which triggers an AWS Lambda function that
triggers the snapshotting feature" : You need to provide the automation layer as it doesn't
exist. This is a very common use case of Lambda.
"Enable RDS periodic backups" - You can enable automatic backups but as of 2019 the retention
period is 0 to 35 days
"Enable RDS Read replicas" - Read replicas to allow read-only data from the master database
"Enable RDS Multi AZ" - Multi AZ allows you to create a highly available application with RDS