Which of the following protocols is used by a NAS storage array to present file systems?

FCIP (Fibre Channel over IP) is a storage networking protocol used to tunnel Fibre Channel traffic over IP networks, primarily for extending Fibre Channel SANs over distance, not for presenting file systems.

CIFS (Common Internet File System), also known as SMB (Server Message Block), is a network file sharing protocol that enables shared access to files and other resources. NAS devices are fundamentally file-level storage systems, and CIFS/SMB is a primary protocol for allowing clients, particularly Windows-based systems, to access these shared file systems over a network.

FCoE (Fibre Channel over Ethernet) is a storage networking protocol that encapsulates Fibre Channel frames directly over Ethernet, used in SANs to transport block-level data, not for presenting file systems.

iSCSI (Internet Small Computer System Interface) is an IP-based storage networking protocol that provides block-level access to storage devices over an IP network, not for presenting file systems directly.