Which two statements are true regarding an Ethernet collision domain?()
A、A. If a switch is used, the collision domain is limited to each device and the switch
B、B. If a hub is used, the collision domain is limited to each device and the hub
C、C. If a hub is used, the collision domain includes all devices connected to the hub
D、D. If a switch is used, the collision domain includes all devices connected to the switch