This question tests your knowledge of the logical hierarchy in PowerFlex:
System $\rightarrow$ Protection Domain $\rightarrow$ Storage Pool $\rightarrow$ Device (Disk)
$\rightarrow$ Volume.
* Configure a Protection Domain (Option A): You cannot create a Storage Pool without a parent entity. The Protection Domain (PD) is the container that isolates a specific group of nodes. Once the PD is created, you create a Storage Pool inside it.
* The Workflow:
* Install SDS software on nodes.
* Create a Protection Domain (e.g., PD_1).
* Add SDS nodes to PD_1.
* Create a Storage Pool (e.g., Pool_SSD) inside PD_1.
* Add devices (drives) to Pool_SSD.
Options B and C are important validation steps, but A is the mandatory structural prerequisite.