To include a specific population of inactive employees in the worksheet, select settings that specify inclusion criteria for inactive users and adjust eligibility accordingly.

Option C: "Select 'Including Inactive Users' when defining the Method of Planner, select 'All employees are eligible' under Eligibility Settings, update eligibility rules to INCLUDE the desired inactive employees."

By enabling the "Including Inactive Users" option, planners can ensure that inactive employees are part of the worksheet. Setting "All employees are eligible" provides a base eligibility, while the eligibility rules can then specifically include only the desired inactive employees based on criteria set in the rule.