def METHOD_NAME(cls, coordinates: Optional[List[Tuple[int, int]]]) -> Optional[List[Tuple[int, int]]]:
    """
    Validates the `coordinates` field.
    Args:
       coordinates: The coordinates to validate.
    Returns:
       The validated coordinates.
    Raises:
       ValueError: If any coordinate value is less than 0.
    """
    if coordinates is None:  # pragma: no cover
        return None
    for coordinate in coordinates:
        if coordinate[0] < 0 or coordinate[1] < 0:
            raise ValueError(f"Invalid coordinate {coordinate}:  values must be greater than or equal to 0.")
    return coordinates