Ensuring you have sufficient Amazon EC2 instances to handle your application's load?

• A. Amazon EC2 Auto Scaling
• B. Amazon EC2
• C. AWS Cost Explorer
• D. AWS App Runner

Answer: (A)

Automatically adjusting the number of EC2 instances in response to demand is the purpose of Amazon EC2 Auto Scaling. It lets you define an Auto Scaling group with a desired capacity, minimum, and maximum size, and it continuously monitors workload metrics (like CPU utilization or request counts). When load rises, it launches new instances to handle the extra traffic; when load falls, it terminates instances to avoid wasted capacity. It also replaces unhealthy instances and distributes traffic through a load balancer, keeping the application available and responsive.

This is the best fit for ensuring you have enough EC2 capacity because it directly manages the fleet size, scales automatically, and works within defined safety bounds. The other options don’t provide this automatic capacity management for EC2: launching and running individual instances without scaling, offering cost analytics rather than scaling, or representing a different service model that abstracts away EC2 capacity (not specifically about scaling EC2 instances).