Which of the following is NOT a category of fraudulent documents?

The reason "legally obtained" is the correct choice for what is NOT a category of fraudulent documents lies in the definition of fraudulence itself. Fraudulent documents are typically characterized by their deceitful nature or the manner in which they were created or acquired.

Categories such as "genuine-fraudulently obtained," "altered genuine," and "totally counterfeit" fall squarely within the realm of fraud. "Genuine-fraudulently obtained" indicates that a legitimate document was obtained through dishonest means. "Altered genuine" refers to an authentic document that has been modified to misrepresent the truth, while "totally counterfeit" signifies a completely fabricated document designed to mimic a real one deceitfully.

In contrast, "legally obtained" implies that the document was acquired through lawful means without any intent to deceive or mislead. Therefore, it does not fit the criteria of a fraudulent document and stands separate from the other categories listed.