Which service supports file sharing?

Alibaba Cloud Network Attached Storage (NAS) is a shared file storage service supporting standard Network File System (NFS) and Server Message Block (SMB) protocols. It allows multiple Elastic Compute Service (ECS) instances, container pods, or HPC nodes to concurrently access a single shared file system for file sharing and centralized data management.

Option A: Object Storage Service (OSS) is a RESTful API-based object store, not a traditional file-sharing service using NFS or SMB protocols.
Option C: Elastic Compute Service (ECS) provides individual virtual machine compute units with local block storage, not a native distributed file-sharing service.
Option D: Content Delivery Network (CDN) caches web content at edge nodes for fast delivery, not for interactive shared file system access.

- Alibaba Cloud Documentation, "Network Attached Storage (NAS) Product Overview", Section: Shared File Storage Protocols (NFS/SMB), Doc ID: nasoverview01.

- Alibaba Cloud Documentation, "NAS Storage Class and Multi-ECS Mounting Guide", Section: Shared File Systems.