A、He got a credit card of his friend and come to ask how to use it. B、He got a card and did not know whose card it is. C、He has

M: The paper money required little effort to carry. If you need large amount of money, you can use a check or credit card to make the payment.
W: This nature of money is called portability and it provides convenience in settling transactions.
Q: What does the word portability mean?

M: I’ve lost my credit card issued by your bank. What should I do, please?
W: I am sorry for that. But you have to go to that counter over there for the card business.
Q: Why does the customer come to the bank?