The correct options are Helm chart templates with values and Kustomize overlays.

Using Helm chart templates with values lets you keep the same Pod and resource templates while supplying different values files for development testing and production. You can store environment specific values files that produce distinct ConfigMaps at install or upgrade time without modifying the templates themselves.

Using Kustomize overlays lets you define a common base and then create overlays for each environment that add or patch ConfigMaps. Overlays allow you to produce environment specific ConfigMaps while leaving the base manifests and Pod templates unchanged.

The option Environment variables is incorrect because environment variables describe how Pods consume configuration but they do not provide a mechanism to generate or select different ConfigMaps per environment without changing manifests or using a templating or overlay tool.

The option Config Connector is incorrect because it is a Google Cloud tool for managing cloud resources via Kubernetes style CRDs and it does not provide the templating or overlay functionality used to supply different ConfigMaps per environment.

The option Dynamic admission controllers is incorrect because although admission webhooks can mutate or inject configuration at admission time this is an advanced and runtime mutation approach rather than the declarative templating and overlay mechanism the question asks for. The standard, simpler solutions for environment specific ConfigMaps are Helm values and Kustomize overlays.

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