Design an object-oriented model for a turn-based, grid-based “drop token” board game similar to Connect Four. Game rules (define these precisely in your design): - The board has `rows` and `cols`. - Players alternate turns. - A move chooses a column; the token falls to the lowest available row in that column. - If a column is full, the move is invalid. - A player wins by forming `K` consecutive tokens in a line (horizontal, vertical, or diagonal). - The game ends when someone wins or the board is full (draw). Requirements: - Provide class/interface design (e.g., `Game`, `Board`, `Player`, `Move`, `Rules/WinCondition`). - Show key methods and responsibilities (no need for full code, but be concrete). - Make it easy to extend (e.g., different win conditions, different gravity direction, or different board sizes). - Discuss how you would test the win-checking logic and move validation.