What is a focus group?

a$)$ It is a method of market research that involves bringing together some people who might use a product and having a researcher question them about it$.$

b$)$ It is a method of market research that focuses on how the industry is performing.

c$)$ It is a method of market research that involves collecting statistics about a group of people who might use a product.

d$)$ It is a method of research that uses unhappy customers.