The correct option is The project remains intact and can be reopened later.

Closing a GitHub project board changes its state to closed while preserving all columns, cards, and activity. The board is removed from the active list but it remains available to reopen whenever needed. The issues and pull requests linked to the board are unaffected and remain in their repositories. You can view closed boards in the organization or repository and reopen one to restore it to the active list without losing any data.

Classic project boards are being phased out in favor of the newer Projects experience. Even so, closing a classic board remains a reversible action that keeps its contents intact, which aligns with this behavior.

All values and insights for the board are erased is incorrect because closing does not delete cards, configuration, or history. Everything remains preserved in the closed board.

The project is permanently deleted from the platform is incorrect because deletion is a separate action. Closing is reversible and does not remove the project or its data.

The project is moved into a separate archive section is incorrect because closed boards are simply listed as closed rather than being relocated to a distinct archive area.

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