This question: $1$ point$($s$)$

Greg heads to Target. As he walks through the door, his phone pings with a notification: As a valued customer, he has been given a digital coupon this trip. Strolling the store, Greg's phone pings again. This time he's notified that a product he's purchased in the past, Tide detergent, is on sale in in this scenario?

A$.$ Blockchain

B$.$ Near$-$field communication

C$.$ Beacons

D$.$ Augmented reality

E$.$ Virtual reality