<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def update_record(self, record, data=None, priority=None, ttl=None, comment=None):
 """ Modifies an existing record for this domain. """

        return self.manager.update_record(self, record, data=data,
            priority=priority, ttl=ttl, comment=comment)