What are two benefits of using FCIP as opposed to sending FCP data over a DWDM/SONET link?

A company is using FCIP to link two remote SANs. What are two benefits of using FCIP as
opposed to sending FCP data over a DWDM/SONET link? (Choose two.)

A.
cost

B.
performance

C.
compatible with iSCSI

D.
uses existing infrastructure