What are the switch and bridge port characteristics of a layer two spanning-tree network that is fully converged?（）

• A、All switch and bridge ports are in the forwarding state.
• B、All switch and bridge ports are in the stand-by state.
• C、All switch and bridge ports are assigned as either root or designated ports.
• D、All switch and bridge ports are in either the forwarding or blocking state.
• E、All switch and bridge are either blocking or looping.