It should be noted that the use of qualitative and quantitative approach to collecting data is known as Triangulation.
<h3>What is triangulation?</h3>
Triangulation simply means the method that is used by researchers to increase the validity and credibility of research findings.
Triangulation is when a researcher uses a qualitative and quantitative approach to collecting data. This is important to make the work credible.
Learn more about triangulation on:
brainly.com/question/1558502
I guess you forgot to mention the options which were
<span>Who is Sigmund Freud?
</span><span>Who is John Watson?
</span><span>Who is Hippocrates? and
</span><span>Who is Carl Rogers?
</span>
And the correct answer is Hippocrates, who was the first to study the mental illness.
