According to the VMware vRealize Operations Install and Configure Guide1, the sizing tool is a web-based application that helps to estimate the required resources and configuration for a vRealize Operations cluster. The sizing tool takes into account various parameters,such as the number and type of objects to be monitored, the number of metrics and properties to be collected, the number of alerts and dashboards to be displayed, the number of users and concurrent sessions, and the desired availability and performance of the cluster.

Two of the additional parameters that are taken into account when sizing a vRealize Operations cluster using the sizing tool are:

Time Series Data Retention: This parameter specifies the duration for which the collected metrics and properties are stored in the vRealize Operations database. The longer the retention period, the more disk space is required for the cluster nodes. The sizing tool allows the user to select the retention period from 1 month to 12 months, or to enter a custom value.

Projected Growth: This parameter specifies the expected increase in the number and type of objects to be monitored over time. The higher the projected growth, the more resources are required for the cluster nodes. The sizing tool allows the user to select the projected growth from 0% to 100%, or to enter a custom value.

Therefore, the correct answers are A. Time Series Data Retention and C. Projected Growth, as these are two of the additional parameters that are taken into account when sizing a vRealize Operations cluster using the sizing tool. References:

1: VMware vRealize Operations Install and Configure Guide, https://docs.vmware.com/en/vRealize-Operations/8.5/vrealize-operations-manager-85-installation-and-configuration-guide.pdf, page 11-13