Answer:
d. phenomenology, ethnography, grounded theory, and historical
Step-by-step explanation:
There are four major types of qualitative research design that have been in use. These four include; the phenomenology (describing something existing integrally as a part of the world we live in), ethnography (a branch of anthropology that gives a scientific account of individual human societies), grounded theory ( allowing theory/theories to emerge from data collection and analysis), and case study/historical (Based on an occurrence or series of occurrences)