You are using ADU and are authenticated and associated to an access point. However，you areunable to obtain an IP address.
Which of these has caused this problem？（）

A Cisco Wireless Location Appliance has been added to track RFID tags placed on laptops beingused in a school. Classrooms at the school have concrete block walls. During testing，you discover thatthe accuracy of the system needs to be improved.You decide to edit the map in the Cisco WCS toadd the interior walls.
How many interior walls can you add to improve the accuracy of the location appliance？（）