What are pilot studies?

Question $5$ options:

$1)$

Studying the decision$-$making environment within which the marketing research will take place.

$2)$

Preliminary research conducted to increase the understanding of a concept, to clarify the exact nature of the problem to be solved, or to identify important variables to be studied.

$3)$

Surveys using a limited number of respondents and often employing less rigorous sampling techniques than are employed in large, quantitative studies.

$4)$

Discussions with knowledgeable individuals, both inside and outside the organization, who may provide insights into the problem.

$5)$

Reviewing information from situations that are similar to the current one.