שאלה | In the MQTT communication protocol, the sender/publisher of the message can configure the message as a retained message. Which of the following is an advantage of this configuration?

In the MQTT communication protocol, the sender/publisher of the message can configure the message as a retained message. Which of the following is an advantage of this configuration?

		If a new client subscribes to a topic on the server, and the server saves a reserved message for this topic - the server sends the reserved message to the client right after the handle of registration.
		The level of reliability at which the message was sent is at the highest level (quality of service level 2) and is therefore the message is guaranteed to be sent to the client
		Clients whose identification method is registered in the reserved message are prioritized by the server - this is how the efficiency of message transferring by the server is maintained
		Setting the message as a reserved message specifies that the message needs to be encrypted. The option to encrypt or not encrypt the message is an advantage because encrypted messages are heavier but safer, while unencrypted messages are lighter but less safe