Final answer:
A hCard is a microformat for exchanging business contact information electronically, similar to a digital business card. It is unrelated to debit or credit card transactions, which involve electronic money transfers from bank accounts or via credit.
Step-by-step explanation:
A hCard is a microformat used to exchange business card information electronically. This format allows users to embed contact information in web pages that can be easily parsed and collected by software tools, facilitating the sharing of contact details similar to how one might use a physical business card. Therefore, the correct answer to the question is option a) A microformat used to exchange business card information electronically.
Debit cards and credit cards provide methods for transferring money electronically. A debit card transfers funds directly from your bank account to the seller, whereas a credit card counts as a short-term loan until you repay the borrowed amount. A smart card, on the other hand, can store a certain value of money that can be utilized for purchases. However, none of these forms of 'plastic money' change the overall quantity of money in the economy.