【单选题】
A cisco wireless location appliance has been added to track rfid tags placed on laptops being used in a school. classrooms at the school have concrete block walls. during testing， you discover that the accuracy of the system needs to be improved. you decide to edit the map in the cisco wcs to add the interior walls.<br /> How many interior walls can you add to improve the accuracy of the location appliance？（）
A、50
B、150
C、100
D、200
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