human
Solve the following python programming problem given the following code:
@ contextmanager 
def mocked_update_node_instance(ctx) : 
    def mock_update_node_instance(_) : 
        raise UpdatedNodeInstance () 
original_update_node_instance = ctx._endpoint.update_node_instance 
    ctx._endpoint.update_node_instance = <MASK> 
    try : 
        (yield) 
finally : 
        ctx._endpoint.update_node_instance = original_update_node_instance 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: ctx, original_update_node_instance
assistant
#Here is a proper replacement for <MASK>.
def mock_update_node_instance(