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You are managing a stateful application deployed on Google Kubernetes Engine (GKE) that can only have one replica. You recently discovered that the application becomes unstable at peak times. You have identified that the application needs more CPU than what has been configured in the manifest at these peak times. You want Kubernetes to allocate the application sufficient CPU resources during these peak times, while ensuring cost efficiency during off-peak periods. What should you do?
Correct Answer: B
A Vertical Pod Autoscaler (VPA) automatically adjusts the CPU and memory requests and limits for a pod based on usage. This is ideal for stateful applications with a single replica, where scaling out horizontally is not possible. It ensures the pod gets more CPU during peak times and reverts to lower usage when idle, thus ensuring performance and cost-efficiency.