问题：

[多选] Which two of these correctly describe Fibre Channel？（）

A .  supports multiple protocols
B .  works only in a shared or loop environment
C .  allows addressing for up to 4 million nodes
D .  allows addressing for up to 8 million nodes
E .  provides a high speed transport for SCSI payloads
F .  may stretch to a distance of up to 100 km before needing extender