What is an advantage of a Layer 2 out-of-band virtual gateway deployment using port-based VLAN assignment?

A.
Manages bandwidth and session time for users during authentication

B.
Supports IP Telephony for end users who are multi-hops away

C.
Improves security as the Client IP address must change when the port is changed form the authentication VLAN to the access VLAN

D.
Simplifies implementation as client IP addresses are not changed

E.
Supports wireless LAN networks providing bandwidth throttling