Final answer:
A person's postal zip code is an example of a nominative variable, which is a categorical variable that serves merely as a label without implying any order or rank.
Step-by-step explanation:
A person's postal zip code is an example of a nominative variable, which is a type of categorical variable. The correct answer to the question is option A) Nominative. In the field of statistics, there are different types of variables used to categorize information. A nominative variable places an individual or item into a category without providing any sort of ranking or order, which is the case with postal zip codes. They are simply labels that identify a location and do not carry any inherent numerical value or order. Therefore, while options B) ordinal and C) interval are also types of variables that involve order and meaningful distances between values respectively, they do not apply to postal codes.