Which of the Following Is Not True About Switched Backbones

Multiple Choice

Which of the following is not true about switched backbones?

A) performance is improved over traditional bridged or routed) backbone networks
B) each connection into the switch is a separate point-to-point circuit which supports simultaneous access by the LANs connected to the switch
C) there are many more networking devices in a switched backbone network
D) if the switch fails, so does the entire backbone network
E) the backbone essentially exists in the switch; there is no backbone cable