Answer:
Archival
Step-by-step explanation:
Archival research is research that involves primary sources held in an archive, a library of special collections which include manuscripts, documents, records, objects, etc. Therefore it is a collection of information from the sources that already exists. What makes it distinctive from empirical research is that unlike empirical research in which hypothesis are made before the collection of data, here we search and analyze data which is already collected in the past.