Which file system protocol is supported by vSphere?

vSphere supports the Network File System (NFS) protocol, which is why this choice is correct. NFS is widely used in virtual environments to allow virtual machines (VMs) to access shared storage over a network. It provides a way for multiple hosts and VMs to access and share data on a centralized server.

Using NFS with vSphere allows for simplified storage management and can facilitate features like vMotion and DRS (Distributed Resource Scheduler), which rely on the ability to access VM files from multiple hosts. It is especially useful in environments where you want to reduce the complexity of storage configurations since it benefits from standard network protocols.

While other protocols like vSAN and iSCSI are indeed used in VMware ecosystems, the question specifically asks about file system protocols, making NFS the relevant choice here. vSAN is a storage solution that combines local storage into a single shared datastore, and iSCSI is a block-level storage network protocol, which does not fit the definition of a file system protocol in the same context as NFS.