Explain why Social Security Number is considered a qualitative variable even though it contains numbers. Choose the correct answer below. A. Since Social Security Number is a variable at the interval level of measurement, it must be qualitative rather than quantitative. B. Social Security Number is a qualitative variable since there are a finite or countable number of values. C. Social Security Number is a qualitative variable since there are an infinite number of possible values that are not countable. D. Addition and subtraction of Social Security Numbers does not provide meaningful results. This makes it qualitative even though it is numeric.