Amber is not sure that she is getting the right data about her customers. There seems to be a disconnect between what they say they will do and what they do$.$ She is convinced she must try observation to see what customers do and discover the real patterns of their actions. She can use several new techniques to investigate her customers' behaviour. Which of the following is NOT an emerging observation technique she should consider?

Using cookies to track what customers do on the firm's website

Building a new, flexible, real$-$time data collection and reporting system to track customer inquiries.

Using shopping carts equipped with GPS to track customers' movements through stores.

Using facial recognition to see who the customers are and how to link purchase behaviours