Which of the following describes a qualitative field?

• A. Numeric measurements such as temperature.
• B. Timestamp values.
• C. Boolean indicators used in calculations.
• D. Category labels such as location or month.

Answer: (D)

This question tests the idea that qualitative fields are categories or labels rather than numbers. A qualitative (categorical) field stores values that identify a category, not a measurement you can arithmetic with. Location or month are classic examples: they name a category (where something is, or which month it is) and aren’t numbers with a quantity attached. You typically use these fields to group, filter, or describe data rather than to perform numerical calculations.

In contrast, numeric measurements like temperature express quantities on a numeric scale; timestamps encode moments in time as numbers; and boolean indicators represent true/false states, which are not category labels in the same sense.