Based on the 802.3ae definition, which capability is a function of WIS?
A. interoperability on the same link with POS, by adapting the Ethernet MAC frames to be based on a serial protocol such as PPP.
B. line clocking based on the synchronous nature of the POS requirements either clocking when the interface is connected back to back or external clockingwhen connected through DWDM.
C. an equivalent POS optical and electrical signal on SONET/SDH protocols and APS to restore link failures in 50 ms.
D. ability for WAN-PHY equipment to generate an Ethernet data stream to map to an OC-192 concatenated payload at the PHY level, without any MAC layerprocessing.
