The correct answer is D because the requirement is not simply additional raw capacity; it is a write-performance target of 500K IOP/s. For HPE Alletra Storage MP B10000 designs, controller-node model selection, node count, shelf count, drive population, and media layout collectively determine whether the configuration can satisfy the performance envelope. Merely increasing the number of drives, as suggested in option C, does not guarantee that the front-end controller resources, CPU, cache, and back-end connectivity can sustain the required write workload. Options A and B use lower or inappropriate node selections for this stated requirement. The B10230 model, combined with additional shelf and drive resources, is the configuration change that aligns the controller and media resources with the required write I/O target. HPE's course outline places HPE Alletra Storage MP B10000 in both general enterprise solution design and database workload solution design, which is exactly the kind of workload-sensitive sizing exercise represented here. The proposal must be validated against the customer's required I/O profile, not only against usable capacity.