The correct option is Use gh extension install github/copilot-cli to add Copilot to the GitHub CLI.

GitHub Copilot in the CLI is delivered as an official GitHub CLI extension, so installation begins by using the GitHub CLI to install the extension from the github/copilot-cli repository. This adds Copilot subcommands to the GitHub CLI and is the supported and documented path for first time setup.

Download the Copilot CLI binary from the GitHub releases page and place it on your PATH is not correct because the supported approach is to install it as a GitHub CLI extension rather than managing a standalone binary.

In Google Cloud Shell run gcloud components install copilot to add the tool to gcloud is not correct because Copilot CLI is not a gcloud component and it is unrelated to Google Cloud’s component manager.

Install Copilot CLI globally with npm install -g copilot-cli is not correct because Copilot in the CLI is not distributed via npm and the installation is performed through the GitHub CLI extension mechanism.

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