To inspect available storage in a Storage Spaces Direct storage pool, which of the following should you use?

Failover Cluster Manager is the correct tool because it provides a centralized interface for managing Storage Spaces Direct (S2D) clusters, including monitoring storage health, capacity, and performance. S2D is a feature of Windows Server Failover Clustering, making Failover Cluster Manager the primary management console. The Get-StorageSubsystem cmdlet is a PowerShell command that provides detailed information about storage subsystems, but it's not the primary graphical tool for overall S2D pool inspection. File Server Resource Manager (FSRM) is used for managing file shares and quotas, not for inspecting the underlying storage pool. Disk Management is a tool for managing individual disks and volumes on a single server, not for a clustered S2D environment.