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A web application is hosted on an Auto Scaling group (ASG) of On-Demand EC2 instances. It has a separate Linux EC2 instance used primarily for batch processing. This particular instance needs to update its configuration file based on the list of the active IP addresses of the instances within the ASG. This is needed in order to run a batch job properly. Which of the following options allows effective updating of the configuration file whenever the Auto Scaling group scales in or out?