Question

a large department store is deploying a new method of payment that allows a shopper to make a payment by placing a smartphone on a sensing device. which service must be enabled on smartphones to support this technology?

• bluetooth
• nfc
• ir
• wi - fi

Explanation:

To determine the correct service, we analyze each option:

• Bluetooth: Used for wireless data transfer over short distances but not typically for contact - based payment by placing the phone on a device.
• NFC (Near - Field Communication): Enables short - range wireless communication between devices when they are in close proximity (like placing a smartphone on a sensing device). It is commonly used for mobile payments.
• IR (Infrared): Used for remote control - like operations and not for this type of payment technology.
• Wi - Fi: Used for network connectivity over a wider area and not for the contact - based payment scenario described.

Answer:

B. NFC