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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 authenticate(self, *args, **kwargs):
 """Authenticate this packet. Returns a boolean indicates whether the packet can be authenticated or not. Returns ``False`` if the Authentication Present (A) is not set in the flag of this packet. Returns ``False`` if the Authentication Section for this packet is not present. For the description of the arguemnts of this method, refer to the authentication method of the Authentication Section classes. """

        if not self.flags & BFD_FLAG_AUTH_PRESENT or \
                not issubclass(self.auth_cls.__class__, BFDAuth):
            return False

        return self.auth_cls.authenticate(self, *args, **kwargs)