The correct option is A deep link that immediately opens a configured GitHub Codespace for a specific repo and branch.

This link can encode the repository, the branch ref, and the path to a devcontainer file so that GitHub creates a codespace with the exact tools, extensions, and settings defined by the project. Newcomers click once and land in an identical workspace which reduces setup friction and ensures consistent environments for onboarding and workshops.

A webhook endpoint used by GitHub Actions for continuous integration is about receiving events from external services to trigger workflows. It does not open a development environment for a repository or select a branch for an editor session.

An invitation link that adds collaborators to a repository is used to grant repository access. It does not provision or launch a codespace with a predefined configuration.

A Google Cloud Shell URL that launches a browser-based terminal in a GCP project is a different service on another platform. It does not create a GitHub Codespaces environment or apply a repository’s devcontainer configuration.

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