Which Ethernet field is used to differentiate between the FCoE frame and the FIP frame？（）

A. It is required to establish the point-to-point FCoE links with the first switch in the path.
B. It is required to establish the point-to-point FCoE links with any switch across multiple Ethernet segments.
C. It is not used to build the FCoE links.
D. It is used to ensure lossless transport.

A. Fibre Channel ports must be configured from the first port in the module.
B. Ethernet ports must be configured from the last port in the module.
C. Fibre Channel ports must be configured from the last port in the module.
D. Ethernet ports must be configured from the first port in the module.