You want to create a report that shows one row per employee, that includes the...

Tool for Aggregation

An Aggregated Calculated Column allows you to perform calculations, such as counting previous employers for each employee, and then display the results in a single row per employee.

Why Other Options are Incorrect

A (Runtime Filters): Filters data but does not aggregate or calculate totals.

B (Calculated Columns): Useful for individual row-level calculations, but aggregation across rows requires Aggregated Calculated Columns.

D (Date Options): Used for filtering or formatting date fields, not for aggregating data.

References

SAP SuccessFactors Aggregated Calculated Columns Guide