The suggested answer is A, B, E.
When configuring a wireless network for dynamic VLAN allocation, the three IETF attributes that must be supplied by the RADIUS server are: Tunnel-Private-Group-ID (81), Tunnel-Medium-Type (65), and Tunnel-Type (64). Tunnel-Private-Group-ID (81) is used to specify the VLAN ID. Tunnel-Medium-Type (65) indicates the type of medium used, which should be set to 802. Tunnel-Type (64) specifies the type of tunnel, which should be set to VLAN. These attributes together ensure the correct VLAN configuration for dynamic allocation.