שאלה | LWM2M - What best describes the DTLS asymmetric encryption flow

LWM2M - What best describes the DTLS asymmetric encryption flow

		Client and server get a shared secret certificate, using it they encrypt all the communication.
		Client sends its private key to the server, the server encrypts the key using a public key and stores it locally in an encrypted format, later the client and the server communicating using the private key they both now share
		A client requests for an authentication token, server sends a unique token to the client with an encrypted private and public key pair
		Server sends its public key to the client, client generates new secret symmetric key, client encrypts the key using the received public key, client sends the key to the server.