Exam SK0-005 topic 1 question 409 discussion

A storage administrator is configuring a new array to provide storage to a virtual cluster. The array has a built-in backup agent to allow data that is stored on the array to be backed up. The storage administrator wants the virtual cluster to use a file-based storage protocol so the backup agent can just back up the files that change and not the whole data store. Which of the following storage protocols should the administrator use?