What is the first step for setting up traffic flows when enabling TLS Proxy in SD-WAN for security?

Question

Options

• AThe sender authenticates the devices and individual users, and the receiver verifies the signature by decrypting the message with the public key of the sender.
• BCertificate authorities in TLS Proxy issue certificates for authentication to all entities such as hosts, network devices, or users.
• CWhen decryption policy is enabled for the flow, a client hello packet is received by Unified Threat Defense to define the decryption action.
• DThe TCP connection is established between the client and the proxy, and between the proxy and the server.