Final answer:
Structured data from an OLTP system is well-organized and easily analyzable. A case study's results might not be generalized, and using secondary data in research is considered nonreactive.
Step-by-step explanation:
The structured data from an Online Transaction Processing System (OLTP) is that it is well-organized and easily analyzable. This type of data is typically stored in a way that is conducive to efficient query processing and transaction management, most often within a relational database system. Structured data in OLTP systems is highly organized, using predefined schemas, such as tables, records, and fields, enabling quick access and straightforward analysis. This type of data storage and management ensures that OLTP systems are highly performative for regular transactional tasks.
Addressing the related questions, the results of a case study are best described as not generally applicable (b), meaning the results are more in-depth but cannot be broadly applied across all scenarios. The use of secondary data is considered unobtrusive or nonreactive (a), as it doesn't involve direct intervention or interaction with subjects being studied.