When new DirectFlash Modules (DFMs) or data packs are physically inserted into a Pure Storage FlashArray, the Purity operating environment detects the new hardware but places the drives in an 'unadmitted' state. This safety mechanism prevents the accidental incorporation of drives and allows the system to verify the firmware and health of the modules before they are actively used to store data.

To formally accept these drives into the system's storage pool so their capacity can be utilized, the administrator must execute the CLI command puredrive admit. Once this command is run, the drive status transitions from 'unadmitted' to 'healthy,' and the array's usable capacity expands accordingly.

Here is why the other options are incorrect:

pureadmin -- admit-drive (A): This is syntactically incorrect. The pureadmin command suite is used for managing administrator accounts, API tokens, and directory services, not for hardware or drive management.

purearray admit drive (B): This is also incorrect syntax. While purearray is used for array-wide settings and status (like renaming the array or checking space), specific drive-level operations are exclusively handled by the puredrive command structure.