What are the advantages of using a mobile device during physical inventory?

Comprehensive and Detailed In-Depth Explanation:

Mobile devices enhance physical inventory in SAP EWM. Option A ("You can use collective counting for bulk storage") is correct because RF devices support collective counting, allowing multiple bins to be counted together, configured via transaction /SCWM/RFUI. Option D ("It is optional to block bins") is correct as mobile counting allows flexibility in bin blocking, unlike desktop processes where blocking may be mandatory, set in SPRO: SCM Extended Warehouse Management > Physical Inventory > RF Settings. Option B is incorrect as recounting may still be needed, and option C (SAP Fiori app) is not standard for EWM PI.