human
Solve the following python programming problem given the following code:
def main() : 
    obj = om.ObjectModelItem ('test') 
    obj.addProperty ('double', 1.0, attributes = om.PropertyAttributes (decimals = 2, minimum = 0, maximum = 100, singleStep = 0.5)) 
    obj.addProperty ('double list', [1.0, 2.0, 3.0], attributes = om.PropertyAttributes (decimals = 2, minimum = 0, maximum = 100, singleStep = 0.5)) 
    obj.addProperty ('int', 1, attributes = om.PropertyAttributes (minimum = 0, maximum = 100, singleStep = 5)) 
    obj.addProperty ('int list', [1, 2, 3], attributes = om.PropertyAttributes (minimum = 0, maximum = 100, singleStep = 1)) 
    obj.addProperty ('bool', True) 
    obj.addProperty ('str', 'value') 
    obj.addProperty ('str list', 0, attributes = om.PropertyAttributes (enumNames = ['value 1', 'value 2', 'value 3'])) 
    obj.addProperty ('color', [1.0, 0.5, 0.0]) 
    panel = PythonQt.dd.ddPropertiesPanel () 
    panel.setBrowserModeToWidget () 
    panel.show () 
    panelConnector = propertyset.PropertyPanelConnector (obj.properties, panel) 
    def onPropertyChanged(propertySet, propertyName) : 
        obj.properties.setPropertyAttribute ('str list', 'enumNames', ['one', 'two', 'three']) 
obj.properties.connectPropertyChanged (<MASK>) 
    obj.setProperty ('bool', False) 
    assert ('one' in obj.properties.getPropertyAttribute ('str list', 'enumNames')) 
    _pythonManager.consoleWidget ().show () 
    startApplication (enableQuitTimer = True) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: obj, panelConnector, panel
assistant
#Here is a proper replacement for <MASK>.
def onPropertyChanged(