An administrator needs to be able to use remaining capacity for storage and memory.

Nutanix separates storage resiliency reservation from compute high availability. For storage, the relevant setting is Rebuild Capacity Reservation, which reserves storage space so the cluster can self-heal and rebuild after node, block, or rack failure. For memory and compute, the relevant concept is High Availability, which reserves or accounts for host resources needed to restart workloads after a host failure. Putting those together gives the combination that best governs the remaining usable storage and memory capacity while preserving fault tolerance. That makes C the most correct answer.

The distractors either use non-standard phrasing or split the concepts incorrectly. “Memory Reservation” by itself is not the standard Nutanix answer when the exam is asking about cluster-wide restart capacity and usable memory after failure accounting. Nutanix administrators think in terms of HA for compute-memory protection and rebuild capacity reservation for storage protection. If the goal is to manage the usable remaining capacity for both storage and memory correctly, the right pair is Rebuild Capacity Reservation and High Availability. Therefore C is the authentic answer.