human
Solve the following python programming problem given the following code:
def contribute_to_class(self, cls, name) : 
    sup = super (RelatedField, self) 
    self.opts = cls._meta 
    if hasattr (sup, 'contribute_to_class') : 
        sup.contribute_to_class (cls, name) 
if ((not cls._meta.abstract) and self.rel.related_name) : 
        self.rel.related_name = (self.rel.related_name % { 
            'class' : cls.__name__.lower (), 
            'app_label' : cls._meta.app_label.lower (), 
}) 
other = self.rel.to 
    if (isinstance (other, six.string_types) or (other._meta.pk is None)) : 
        def resolve_related_class(field, model, cls) : 
            field.rel.to = model 
            field.do_related_class (model, cls) 
add_lazy_relation (cls, self, other, <MASK>) 
else : 
        self.do_related_class (other, cls) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: sup, cls, other, self, name
assistant
#Here is a proper replacement for <MASK>.
def resolve_related_class(