שאלה | One of the properties of MQTT is persistent session. For which of the following situations this property is useful?

One of the properties of MQTT is persistent session. For which of the following situations this property is useful?

		In the event that Client A wants its contact information with the server to be forwarded to Client B
		In the event that Client A wants its contact information with the server to be retained even if it is unexpectedly disconnected
		In the event that Client A wants message ACKS that it sent to the server, will be sent to him consistently
		None of the above