When comparing and contrasting the similarities and differences between bridges and switches, which of the following are valid statements?（）

• A、Bridges are faster than switches because they have fewer ports.
• B、A switch is a multiport bridge,
• C、Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
• D、A bridge will forward a broadcast but a switch will not.
• E、Bridges and switches increase the size of a collision domain.
• F、None of the above statements are true.