Which of the following is NOT a feature of "digital wallet"？（Paragraph One)A．It has alread

Which of the following is NOT a feature of "digital wallet"？(Paragraph One)

A．It has already emerged in the developed countries by V. me.

B．Although it is virtual, it has the same functions with payment cards.

C．It only requires the users to enter a username and a password.

D．Its service is only provided by Visa, a card-payment network.

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