An administrator needs to enable software data-at-rest encryption on a 2-node ROBO cluster.

Here the uploaded answer key says D, but official Nutanix documentation supports B. Nutanix documents that for enhanced security of ROBO environments (typically 1- or 2-node clusters), administrators should select Native KMS (remote) for software-based encryption. Nutanix also states in KMS considerations that software encryption using Native KMS is supported for ROBO deployments using the Native KMS (remote) KMS type. Because the question explicitly describes a 2-node ROBO cluster and requires the keys to be stored outside the cluster, the Nutanix-authentic answer is B. Native KMS (remote).

An external KMS is valid in many enterprise encryption designs, but this question is more specific: it asks for the KMS type Nutanix supports and recommends for software encryption on a ROBO cluster. On that narrow requirement, the official docs point to Native KMS (remote) rather than External KMS. So for an authentic study guide aligned to Nutanix documentation, B is the correct answer.