Which statement best describes Horizontal Scaling?

Which statement best describes Horizontal Scaling?

• A. It scales by increasing the size of a single instance
• B. It changes the resource type rather than quantity
• C. It adds or removes instances to the pool of existing resources
• D. It scales the speed of the network

Answer: (C)

Horizontal scaling means increasing or decreasing the number of identical resources handling requests, so load is spread across multiple instances. In Kubernetes this is done by adjusting the number of replicas or using a HorizontalPodAutoscaler to add or remove pods as demand changes. This is different from vertical scaling, which would mean giving a single resource more CPU or memory (resizing the instance). The statement that describes adding or removing instances to the pool of existing resources matches this concept. The other options describe increasing the power of a single instance, changing the resource type, or altering network speed, which are not horizontal scaling.

Horizontal scaling means increasing or decreasing the number of identical resources handling requests, so load is spread across multiple instances. In Kubernetes this is done by adjusting the number of replicas or using a HorizontalPodAutoscaler to add or remove pods as demand changes. This is different from vertical scaling, which would mean giving a single resource more CPU or memory (resizing the instance). The statement that describes adding or removing instances to the pool of existing resources matches this concept. The other options describe increasing the power of a single instance, changing the resource type, or altering network speed, which are not horizontal scaling.