A customer is installing a new system.

When assessing storage configurations during ONTAP SAN solution design, one key objective may be maximizing usable data capacity.Advanced Drive Partitioning (ADP)is specifically designed to optimize disk utilization, especially in all-flash and hybrid systems.

ADP allows a single physical disk to be partitioned into multiple logical segments that serve different purposes, such as root data, user data, and spare capacity. This significantly reduces the number of disks reserved exclusively for system use and increases the total amount of disk space available for user data.

RAID-DP and RAID4 provide data protection but do not increase usable capacity; in fact, they reserve parity disks, reducing available space. Flash Pool combines SSDs with HDDs to create caching aggregates, which improves performance but does not maximize raw data capacity.

By contrast, ADP is explicitly intended to maximize usable storage by minimizing overhead. This makes it the optimal choice when the primary requirement ismaximum available data space.

Therefore, the correct answer isD (ADP).