Final answer:
A sociologist using WHO demographic data for a research study serves as an example of an external user utilizing secondary data, which is nonreactive and maintains the authenticity of original behaviors and trends.
Step-by-step explanation:
An example of an external user utilizing secondary data could be a researcher in the field of sociology analyzing demographic data collected by the World Health Organization (WHO) to study public health trends without interfering with the behavior of the subjects of the study. The use of secondary data is advantageous here because it is a form of nonreactive research, which maintains the authenticity of the data since the presence of the researcher does not alter participants' behaviors. A comparative historical secondary data analysis would involve a sociologist examining economic records from a different period in history to identify social trends.