The correct option is It considers the open file and other related files in the project.

GitHub Copilot generates suggestions by drawing context from the code and comments in the file you are editing. It can also use information from other files in your workspace that are relevant to the code you are writing which helps it produce coherent and consistent completions within the project.

It reads the entire repository and uses every file is incorrect because Copilot does not scan every file in the repository for each suggestion and it operates within a limited context window so that suggestions remain fast and focused.

It limits itself to the single file currently open is incorrect because Copilot can incorporate project context beyond the active file when related symbols or imports indicate useful connections.

It uses only the characters on the current line is incorrect because the model reads surrounding code and comments in the current file and can use additional project context to better understand intent.

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