Which of these commands is used to retrieve the documentation and field definitions for a Kubernetes resource?

`kubectl explain` recursively prints the documentation and schema for a given Kubernetes resource and its nested fields. This command is essential for understanding the structure, purpose, and valid values of resource fields, aiding in the correct authoring of YAML manifests.

`kubectl api-resources` lists the types of API resources available in the cluster, not their detailed documentation or field definitions.

`kubectl show` is not a standard or recognized kubectl command for retrieving resource documentation.