One way that brick-and-mortar retailers are trying to extend the functionality of their stores to make them more attractive to online shoppers is through the use of small, in-store RFID devices that can interact with shoppers' smartphones, tracking them, and offering them information and personalized deals in different sections of the store. This technology is called:
A. a personal shopping assistant
B. a beacon
C. an interactive digital display
D. an interactive dressing room E. a choice board
Answer: B