Which of the following is NOT a type of fraud mentioned?

The question asks for a type of fraud that is not mentioned in common categories of fraud. Employee fraud against employers, crimes against customers, and crimes against financial institutions are all recognized categories of fraudulent activity.

Employee fraud against employers typically involves actions such as theft, embezzlement, or misreporting time worked — all detrimental to the company. Crimes against customers include a variety of fraudulent schemes that target customers directly, leading to financial loss and a breach of trust. Crimes against financial institutions encompass fraud that typically affects banks or other financial services, such as check fraud or securities fraud.

In contrast, bank fraud is a specific type of fraud that involves deceit specifically committed against a banking institution, which is usually included under the broader category of fraud against financial institutions. It's more precise to categorize this form of fraud under the acts committed against those institutions rather than labeling it as a separate category itself. Therefore, the term "bank fraud" being considered a distinct type of fraud is the reason it might not fit neatly into the provided categories in the question.