问题：

[多选] Which three statements about firewall modes are correct？ （）

A .  A firewall in routed mode has one IP address
B .  A firewall in transparent mode has one IP address
C .  In routed mode， the firewall is considered to be a Layer 2 dew
D .  In routed mode， the firewall is considered to be a Layer 3 device
E .  In transparent mode， the firewall is considered to be a Layer 2 device
F .  In transparent mode， the firewall is considered to be a Layer 3 device