Answer:
Secondary research
Step-by-step explanation:
Secondary research: It is research based on the data collected by others and research done on primary research. Existing data are collected and summarized to increase the effectiveness of research. There are different sources from where data are collected, analyzed and interpreted.
In the given case, PR firm have done research on already existing data and research by blogs or news stories, therefore, this type of research is an example of secondary research.