Which AWS service automatically adds or removes Amazon EC2 instances to maintain application availability and match changing demand, helping optimize performance and cost?
AWS Compute Optimizer
Amazon EC2 Auto Scaling
Application Load Balancer
Amazon CloudWatch
Amazon EC2 Auto Scaling automatically launches or terminates Amazon EC2 instances within an Auto Scaling group so that the fleet size tracks demand. It supports dynamic, scheduled, and predictive scaling policies. AWS Compute Optimizer provides rightsizing recommendations but does not launch or terminate instances. An Application Load Balancer distributes traffic but does not change the number of instances. Amazon CloudWatch monitors resources and can trigger alarms, yet it relies on an Auto Scaling policy to perform the scaling itself.
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