Which tool or technique could be used to gain an objective, first-hand insight into tasks and activities that are difficult to describe?

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After conducting a brainstorming session with a group of project participants, the business analyst feels that the elicited requirements are biased.

Which tool or technique could be used to gain an objective, first-hand insight into tasks and activities that are difficult to describe?
A . Observation
B . Document analysis
C . Questionnaires and surveys
D . Traceability matrix

Answer: A