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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def closest(self, obj, group, defaults=True):
 """ This method is designed to be called from the root of the tree. Given any LabelledData object, this method will return the most appropriate Options object, including inheritance. In addition, closest supports custom options by checking the object """

        components = (obj.__class__.__name__,
                      group_sanitizer(obj.group),
                      label_sanitizer(obj.label))
        target = '.'.join([c for c in components if c])
        return self.find(components).options(group, target=target,
                                             defaults=defaults)