Which statement is not correct?

a. A DAS does not offer out-of-the-box capabilities for centralized storage management and sharing unused disk capacity across servers.

b. A SAN is typically best in terms of performance because it often uses Fibre Channel, the LAN network is freed from storage-related traffic, and Fibre Channel-compatible storage devices have some onboard intelligence, which allows them to perform certain tasks autonomously, e.g., server-free backups.

c. Compared to SAN, a NAS is much less expensive and much simpler in software and hardware. However, it achieves performance similar to a NAS set-up.

d. A NAS gateway receives file-level I/O requests from servers connected to the LAN or WAN and translates these into SCSI block I/O commands to access the external storage devices; this latter connection can be organized by DAS or SAN technology.