Inter-VLAN routing has been implemented in the Company network. In VLAN routing，  what are  some of the disadvantages of designing a router-on-stick configuration？ （）

• A、 InterVLAN routing cannot be filtered by the router.
• B、 The router becomes a single point of failure for the network.
• C、 Routers will not route STP BPDUs.
• D、 There is a possibility of inadequate bandwidth for each VLAN.
• E、 Additional overhead on the router can occur.
• F、 NetFlow Switching is required for InterVLAN accounting.