An organization is migrating its HR application to an Infrastructure as a Service (IaaS) model in a private cloud. Who is PRIMARILY responsible for the security configurations of the deployed…

The cloud provider is responsible for the security *of* the cloud (e.g., physical infrastructure, virtualization platform) but not the security *in* the cloud at the operating system level for an IaaS offering.

The cloud provider's external auditor assesses the provider's controls, but they do not hold responsibility for the security configurations of the customer's operating systems.

The operating system vendor provides the OS, but the organization deploying it is responsible for its configuration, patching, and ongoing security management.

In an IaaS private cloud model, the cloud provider manages the underlying infrastructure (physical servers, virtualization, networking), but the customer (the organization in this case) is responsible for everything "above the hypervisor," which includes the operating system, applications, data, and their respective security configurations. This aligns with the shared responsibility model for cloud security.