The correct option is gh extension install github/gh-copilot.

This command uses the GitHub CLI extension system to fetch and install the official Copilot extension from the github organization repository. Installing the extension adds the Copilot subcommands to the GitHub CLI so you can run Copilot commands through gh.

npm install -g github-copilot is incorrect because Copilot in the GitHub CLI is delivered as a gh extension and not as a global Node package.

gcloud components install copilot is incorrect because that is the Google Cloud SDK and it does not manage GitHub CLI extensions.

gh copilot install is incorrect because there is no built-in copilot subcommand before the extension is installed and installation is done through the gh extension install mechanism.

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