What is the difference between hypothesis testing and discovery-based research?

What is the difference between hypothesis testing and discovery-based research?
 
  A. Hypothesis can be validated or invalidated while discovery-based research relies more on collection and analysis of data without a hypothesis
  B. Discovery-based science can be validated or invalidated while hypothesis based research relies more on collection and analysis of data
  C. There is only one type of experimental approach, both terms describe the same approach.
  D. Hypothesis-based research results in believable science while discovery-based research results in unreliable conclusions.