<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_option_names(self):
 """returns a list of fully qualified option names. returns: a list of strings representing the Options in the source Namespace list. Each item will be fully qualified with dot delimited Namespace names. """

        return [x for x in self.option_definitions.keys_breadth_first()
                if isinstance(self.option_definitions[x], Option)]