Which two of the following statements describe a routed switch port on a multilayer switch？（）
- ALayer 2 switching and Layer 3 routing are mutually supported.
- BThe port will not be associated with any VLAN.
- CThe routed switch port supports VLAN subinterfaces.
- DThe routed switch port is used when a switch has only one port per VLAN or subnet.
- EThe routed switch port ensures that STP remains in the forwarding state.