Which of the following provides a packaging format for managing Kubernetes applications?

The correct choice, Helm chart, is a powerful tool for managing Kubernetes applications, acting as a packaging format that simplifies deployment and management. Helm charts allow users to define, install, and upgrade even the most complex Kubernetes applications with ease. This is particularly useful because they encapsulate all the required resources for an application within a single package, making it easier to share and reuse.

Helm charts use a specific structure that includes templates to render Kubernetes manifest files and a values file to customize the deployment. This allows teams to manage configurations more elegantly and ensures that applications can be deployed reliably across various environments.

In contrast, a Dockerfile is primarily a script containing instructions on how to build a Docker image, YAML configuration refers to files that define resources in Kubernetes, but do not package them into a single deployable format, and API documentation is focused on describing how to interact with an API, which is unrelated to managing applications in Kubernetes.