She uses the Radio-frequency identification(RFID) which is a technology that uses electromagnetic fields to automatically identify and track tags attached to objects.These tags contain electronically-stored information.the passive tags collect energy from a nearby RFID readers interrogating radio waves.They contain an integrated circuit and an antenna which are used to transmit data to the RFID reader also called an interrogator.
The answer is B. RFID The use of this technology has enabled tagging of items that made it easier to track the sold and needed items. It applied this process to all of its stores that increased efficiency. Macy's was able to use it in 2008 and made further improvements in using RFID technology in 2012.
