Which of the following statements describes a beacon?
a. It is a device that sends out connecting signals to customers' smartphones and tablets to bring them into a retail store.
b. It is an application used by retailers that allows customers to bring used products for donation at the store.
c. It is a machine that offers goods for sale.
d. It is a technological interface that allows customers to provide themselves with products without the help of an employee.
Answer: a. It is a device that sends out connecting signals to customers' smartphones and tablets to bring them into a retail store.