C: Adding Storage Only nodes:
* Nutanix allows for the addition of storage-only nodes to a cluster. These nodes provide additional storage capacity without adding compute resources, which is a cost-effective way to increase storage for data retention and compliance purposes.
* This capability allows the prospect to scale storage independently of compute, addressing concerns about data retention costs by adding capacity as needed without the overhead of additional CPU and memory resources.

To maintain optimal metadata balance and data availability, and to meet the requirements for storage capacity, memory, and CPU cores, the recommended configuration should align closely with the existing node configurations while providing the necessary resources.
A:2x NX-3060-G5 - 2x E5-2620v4 processors, 128GB RAM, 2x 960GB SSDs, 4x 2TB HDDs:
* Adding two additional NX-3060-G5 nodes with the same specifications as the existing nodes ensures uniformity and maintains metadata balance and data availability.
* This configuration provides enough additional storage capacity, memory, and CPU cores to accommodate the new workloads.
References:
* Nutanix documentation on cluster expansion and the importance of maintaining uniform node configurations for optimal performance and reliability.