A developer must maintain identical copies of pods deployed or run at any given time. To maintain these copies, a ReplicaSet Kubernetes controller is used. The controller is defined in a file named "d

The `kubectl create -f <filename>` command is the standard and most direct way to create Kubernetes resources (like ReplicaSets, Deployments, Services, etc.) from a manifest file. It parses the YAML or JSON definition in `devnet.yaml` and submits it to the Kubernetes API server, which then creates the specified ReplicaSet in the cluster.

`kubectl run` is typically used to create and run a single pod or a deployment directly from an image, not to create resources defined in a YAML file.

`kubectl rollout` is used for managing the rollout of deployments, such as updating, pausing, or undoing a deployment, not for the initial creation of a ReplicaSet from a file.

`kubectl set` is used to update specific fields of Kubernetes objects, like images, environment variables, or resource limits, not for initial creation of a resource from a manifest file.