In both the United States and Europe, micropayment services are based on a “_____________________” model in which individual service providers run their own separate payment systems.
A. flower garden
B. walled garden
C. enclosed garden
D. sacred garden
Answer:B
In both the United States and Europe, micropayment services are based on a “_____________________” model in which individual service providers run their own separate payment systems.
A. flower garden B. walled garden C. enclosed garden D. sacred garden