This increases the likelihood of document exfiltration where someone inserts a thumb drive into a computer, copies, and exfiltrates sensitive information. Document duplication or document classification is not a risk in itself.

EDIT: The last statement is not necessarily true (ala "China vs US Government Info Systems"). USB drives can contain malicious code that requires no user intervention beyond inserting into a (classified) computer that will completely erase, copy, or make unauthorized modifications to. Recommend changing correct answer to "All of these". EDIT: Changing correct answer back to what it originally was. For this test, you will need to choose the BEST answer. The BEST answer in this question is exfiltration. the option 'document classification' does not fit as an answer thus the answer 'all of the above' does not work. If the options said 'modification of classification' perhaps it would work, but it doesn't, just says 'document classification'.