<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def delete(self):
 """Delete the NTP source entry from the node. Returns: True if the operation succeeds, otherwise False. """

        cmd = self.command_builder('ntp source', disable=True)
        return self.configure(cmd)