A customer would like to add virtual machines to a non-hyperconverged cluster, and the administrator...

 The option within the What-If Analysis feature that should be used to obtain the information is Workload Planning: Traditional. This option allows the administrator to define scenarios that can potentially add or remove workloads to or from actual data centers orcustom data centers. vRealize Operations models the scenario and calculates whether the desired workload can fit in the targeted data center or custom data center, and how it affects the capacity and performance of the cluster1. The administrator can also specify the profile of the workload, the start and end date of the scenario, and the annual projected growth of the workload2.

The other options are not correct, because they do not match the use case of adding virtual machines to a non-hyperconverged cluster. Cluster Planning: Traditional allows the administrator to define scenarios that can potentially add or remove hosts to or from clusters, and evaluate the impact on the cluster capacity and performance3. Virtual Machine Planning: Traditional allows the administrator to define scenarios that can potentially add or remove virtual machines to or from hosts, and evaluate the impact on the host capacity and performance. Infrastructure Planning: Traditional allows the administrator to define scenarios that can potentially add or remove infrastructure components, such as datastores, networks, or adapters, and evaluate the impact on the infrastructure capacity and performance.

References:

What-If Analysis - Workload Planning: Traditional - VMware Docs

What-If Analysis with vRealize Operations 8.0 - VMware Blogs

What-If Analysis - Cluster Planning: Traditional - VMware Docs

[What-If Analysis - Virtual Machine Planning: Traditional - VMware Docs]

[What-If Analysis - Infrastructure Planning: Traditional - VMware Docs]