When configuring a VNX Gateway system, which is a compatible backend storage configuration method?
A. VNX Gateway system connected to a VNX Block Only system via FCoE
B. VNX Gateway system connected to a VNX Block Only system via FCiP
C. VNX Gateway system connected to a Symmetrix system via iSCSI
D. VNX Gateway system connected to a Symmetrix system via iFCP