Which statement correctly describes the difference between proximity cards and smart cards?

Which statement correctly describes the difference between proximity cards and smart cards?

• A. Proximity cards communicate more information than smart cards.
• B. Proximity cards are designed to only communicate the card's ID, while smart cards can communicate more information.
• C. Proximity cards require physical contact to read the ID, while smart cards are contactless.
• D. Proximity cards operate at 13.56 MHz, while smart cards operate at 125 kHz.

Answer: (B)

The key idea here is what each type of card is capable of communicating and processing. Proximity cards are designed to simply transmit the card’s identifier when they’re in a reader’s field. They are usually passive devices with little to no ability to store or process information themselves. Smart cards, on the other hand, have an embedded microprocessor and memory, so they can store multiple data items, perform cryptographic operations, run authentication checks, and handle more complex interactions with a reader. That combination of data storage and on-card processing means smart cards can convey or verify much more than just a single ID. So, the statement that proximity cards primarily communicate the card’s ID while smart cards can communicate more information accurately captures the practical difference between them. The other descriptions don’t fit: proximity cards aren’t defined by requiring physical contact (they’re typically contactless), and the frequency used is not the defining factor—the real distinction is the processing capability and the amount of information that can be exchanged.

The key idea here is what each type of card is capable of communicating and processing. Proximity cards are designed to simply transmit the card’s identifier when they’re in a reader’s field. They are usually passive devices with little to no ability to store or process information themselves. Smart cards, on the other hand, have an embedded microprocessor and memory, so they can store multiple data items, perform cryptographic operations, run authentication checks, and handle more complex interactions with a reader. That combination of data storage and on-card processing means smart cards can convey or verify much more than just a single ID.

So, the statement that proximity cards primarily communicate the card’s ID while smart cards can communicate more information accurately captures the practical difference between them. The other descriptions don’t fit: proximity cards aren’t defined by requiring physical contact (they’re typically contactless), and the frequency used is not the defining factor—the real distinction is the processing capability and the amount of information that can be exchanged.