cost of product is reduced protection of private information ability to track customer preferences funds would be credited immediately
I gave my students this multiple choice question: Some businesses offer customers the option to pay for merchandise using their fingerprints as identification. Which of the following would most benefit customers that use this new technology?

Only one answer is correct among these 4 choices:
- cost of product is reduced
- protection of private information
- ability to track customer preferences
- funds would be credited immediately

Could you tell me which one is correct?

protection of private information