a. When two devices communicate using NFC, how close must they be?

18a.) When two devices communicate using NFC, how close must they be?

a. A few inches

b. Up to 5 feet

c. Up to 10 feet

d. Up to 50 feet

b. How does near field communication differ from normal radio communication?

c. Passive RFID chips have no batteries. How can they transmit when queried?

18c.) Passive RFID chips get the power needed to transmit from _______.

a. Wall power

b. Coin batteries

c. The electricity that always flows through the air in small quantities

d. None of the above

d. What is the state of NFC standards?

18d.) NFC transmission standards have been set for  _______.

a. Its service band

b. Mesh networking

c. Both A and B

d. Neither A nor B