When should you consider Auto Scaling for your AWS applications?

Auto Scaling in AWS is a powerful feature that enables automatic adjustment of the number of instances in response to demand. The correct choice, which suggests considering Auto Scaling when demand for your application is unpredictable, highlights one of the primary advantages of this feature.

When demand is unpredictable, applications can experience fluctuations in traffic. If the traffic suddenly increases, having Auto Scaling allows your application to automatically launch additional instances to handle the load, ensuring optimal performance and maintaining a responsive user experience. Conversely, during periods of low demand, Auto Scaling can terminate unnecessary instances, helping to reduce costs by only using resources when needed. This dynamic adjustment allows applications to efficiently match supply with demand, leading to better performance and cost efficiency.

In contrast, other options do not take advantage of the core benefits that Auto Scaling provides. Frequent manual intervention, for example, indicates a static approach to managing resources, while running a single instance does not leverage the scalability features of AWS. Similarly, prioritizing high costs over performance negates the cost-saving and performance-enhancing potential of Auto Scaling. Therefore, unpredictable demand is the key scenario where Auto Scaling becomes essential.