A Kubernetes administrator wants to improve the performance of an application running in Kubernetes. They have determined that the four replicas currently running are not enough to meet demand and want to increase the total number of replicas to six. The name of the deployment is my-app-123. What command should they use?

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A Kubernetes administrator wants to improve the performance of an application running in Kubernetes. They have determined that the four replicas currently running are not enough to meet demand and want to increase the total number of replicas to six. The name of the deployment is my-app-123. What command should they use?