<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_json(self):
 """ Returns the options as JSON. :return: the object as string :rtype: str """

        return json.dumps(self.to_dict(), sort_keys=True, indent=2, separators=(',', ': '))