Comprehensive and Detailed Explanation:
A data inventory is a critical tool for privacy management, helping organizations track where data is stored, how it is used, and what security measures protect it.
Option A (Where the data is located) - Data inventories map storage locations and data flows.
Option B (How the data is protected) - Data inventories document security controls and access restrictions.
Option C (How the data is being used) - Data inventories define data processing purposes and retention policies.
Option D (What the format of the data is) - While the format (structured/unstructured, JSON, CSV, etc.) may be noted, it is not a primary function of a data inventory.