Which of the following is NOT an example of e-fraud?

The choice indicating accepting cash for services is not an example of e-fraud because it typically involves face-to-face transactions where electronic methods are not utilized. E-fraud generally refers to fraudulent activities that exploit digital channels and technologies.

In contrast, unauthorized credit card use, online auction dealings, and false investment schemes all involve electronic transactions or the internet in some capacity, making them relevant examples of e-fraud. For instance, unauthorized credit card use involves stealing someone's card information and making transactions online without authorization. Online auction dealings might involve misrepresentation of items or failure to deliver goods as promised when conducted over the internet. False investment schemes often utilize online platforms to deceive individuals into investing in non-existent ventures. These activities distinctly categorize them as e-fraud, whereas accepting cash does not engage electronic fraud mechanisms.