Which of these is true of a Layer 3 out-of-band NAS deployment？（）

• A、 The NAS acts as a gateway for all Layer 3 traffic.
• B、 Only the MAC address is used to identify the client device.
• C、 User traffic remains on the same VLAN for the duration of the connection.
• D、 After authentication and posture assessment， client traffic no longer passes through the NAS.