Multifactor authentication requires mixing two factors. The existing password is a “something you know” factor, so we need to use factors from another category to achieve multifactor authentication. Now remember, you need to read these questions carefully. This question is asking you which one of these factors would NOT create multifactor authentication, so we’re going to eliminate the choices that WOULD create multifactor authentication. It would be appropriate to add a “something you are” factor, such as a retinal scan, so we can eliminate that choice. We could also use a “something you have” factor, such as an ID card or smartphone. On the other hand, adding another “something you know” factor, such as security questions, would not qualify as multifactor authentication, so that’s our correct answer here.