human
Solve the following python programming problem given the following code:
@ override_extensions_api_settings (DEFAULT_CACHE_RESPONSE_TIMEOUT = 100, DEFAULT_CACHE_KEY_FUNC = Mock (return_value = 'cache_response_key')) 
def test_should_store_response_in_cache_with_timeout_from_settings(self) : 
    cache_response_decorator = cache_response () 
    cache_response_decorator.cache.set = Mock () 
    class TestView (views.APIView) : 
        @ cache_response_decorator 
        def get(self, request, * args, **kwargs) : 
            return Response ('Response from method 4') 
view_instance = TestView () 
    response = view_instance.dispatch (request = self.request) 
    self.assertTrue (cache_response_decorator.cache.set.called, 'Cache saving should be performed') 
    self.assertEqual (<MASK>.cache.set.call_args_list [0] [0] [2], 100) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: self, response, cache_response_decorator, view_instance
assistant
#Here is a proper replacement for <MASK>.
cache_response_decorator