What does the "service code" in Cardholder Data typically indicate?

The service code in Cardholder Data is primarily used to indicate the intended usage limitations of a card, which is why the correct answer relates to option C. This code provides information on how the card can be used, including aspects such as whether the card is valid for international transactions, whether it can be used for online purchases, and other restrictions that might apply to its use.

For example, certain service codes might specify that a card is only valid for use in certain geographical locations or that it has limitations on types of purchases. This information is crucial for merchants and payment processors to ensure they are complying with the rules around card usage and to prevent fraudulent transactions.

The other options, while related to card information, do not accurately describe the function of the service code. The type of payment method, validity of the card, and issuer identity are indicated in other fields within the card data but are not the primary purpose of the service code itself.