@staticmethod
def _classification_function_zero(att1, att2, att3):
    """ classification_function_zero
        
        Decides the sample class label based on the sum of att1 and att2, 
        and the threshold value of 8.
        
        Parameters
        ----------
        att1: float
            First numeric attribute.
            
        att2: float
            Second numeric attribute.
            
        att3: float
            Third numeric attribute.
        
        Returns
        -------
        int
            Returns the sample class label, either 0 or 1.
        
        """
    return 0 if att1 + att2 <= 8 else 1
