שאלה | A certain customer is registered for three types of messages. While waiting on updates for one of the types, the communication has disconnected. Now the client is forced to re-register for all message type. What should he do this time so that in the event of another disconnection of communication, the customer will not have to register for all types of messages again?

A certain customer is registered for three types of messages. While waiting on updates for one of the types, the communication has disconnected. Now the client is forced to re-register for all message type. What should he do this time so that in the event of another disconnection of communication, the customer will not have to register for all types of messages again?

		Sign up for a second level ("at least one") since it is known that this level preserves the types of messages even in case of disconnection.
		There is nothing the customer can do
		The customer must perform a "handshake" with the broker before sending the advertisement
		The client must send a message with the persistent session flag

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