. In order to implement the [Requirements], Mr. B investigates systems that use
commercial RFIDs, and considers the solution plan described below. (i) Prepare a user card that contains a built-in RFID, stick a sheet-shaped RFID onto a book, and then install the new RFID reader to be used at the counter for the lending and return operations (ii) Install RFID readers in the shelf panel of all book shelves, and implement a system for checking the books and book shelves (iii) Install an RFID reader in the return box
Mr. B considers the effects of options (i) through (iii), and as a result, he notices that
there is a requirement that cannot be fulfilled with them. Which of the following is
the item of [Requirements] that cannot be fulfilled?