Unified storage refers to a storage system capable of serving both block-level (SAN) and file-level (NAS) storage protocols from a single, integrated platform. Pure Storage FlashArray embodies this by providing industry-standard block protocols like Fibre Channel and iSCSI, alongside native file services for NFS and SMB protocols. This consolidation allows organizations to support a wide range of applications, from databases requiring block storage to user shares and applications needing file storage, all from one array.

A. This describes a multi-protocol NAS system but omits the block storage component, which is essential for a system to be classified as "unified."

C. This describes a multi-protocol SAN, as both iSCSI and Fibre Channel are block-level protocols. It lacks the required file-level protocol support.

1. Pure Storage, Inc. (2021). FlashArray File Services: Enterprise-Grade NFS and SMB for Your Most Demanding Workloads. White Paper. p. 2. "FlashArray with Purity 6.1 is a unified block and file storage platform."

2. Pure Storage, Inc. (2023). Purity//FA 6.5.0 Release Notes. Section: "File Services". This document outlines the capabilities of native file services (NFS/SMB) running concurrently with block services on the FlashArray platform.