问题：

[多选] Fibre Channel， or FC， is a gigabit-speed network technology primarily used for storage networking.Fibre Channel is standardized in the T11 Technical Committee of the InterNational Committee forInformation Technology Standards （INCITS）， an American National Standards Institute （ANSI）Caccredited standards committee. 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 .  provides a high speed transport for SCSI payload