Which two of the following statements describe a routed switch port on a multilayer switch？（）
A. Layer 2 switching and Layer 3 routing are mutually supported.
B. The port will not be associated with any VLA
C. The routed switch port supports VLAN subinterfaces.
D. The routed switch port is used when a switch has only one port per VLAN or subnet.
E. The routed switch port ensures that STP remains in the forwarding state.
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