human
Solve the following python programming problem given the following code:
def fakeResponse(self) : 
    res = flexmock (name = 'response') 
    res.headers = { 
        
} 
    res.cookies = { 
        
} 
    res.deleted_cookies = { 
        
} 
    res.redirect_location = None 
    res.out = StringIO.StringIO () 
    def fake_set_cookie(key, value = '', max_age = None, path = '/', domain = None, secure = None, httponly = False, comment = None, expires = None, overwrite = False) : 
        res.cookies [key] = value 
def fake_delete_cookie(key, path = '/', domain = None) : 
        res.deleted_cookies [key] = 1 
def fake_clear() : 
        pass 
def fake_redirect(path, response) : 
        res.redirect_location = path 
res.set_cookie = fake_set_cookie 
    res.delete_cookie = <MASK> 
    res.clear = fake_clear 
    res.redirect = fake_redirect 
    return res 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: fake_clear, self, fake_set_cookie, res, fake_redirect
assistant
#Here is a proper replacement for <MASK>.
def fake_delete_cookie(