Explanation
The timing of the business analysis activities in the plan-driven approach includes defining when enterprise analysis, requirements analysis, solution assessment, and validation activities occur. It does not, however, include the timing of the business analysis governance.
Answer D is incorrect. Enterprise analysis timing should be defined as part of the business analysis approach.
Answer A is incorrect. Requirements analysis should be defined as part of the business analysis approach.
Answer B is incorrect. Solution assessment should be defined as part of the business analysis approach.

Explanation/Reference:
Decomposition describes the process of taking the product or project scope and breaking it down into smaller, more manageable units.
Decomposition is not an elicitation technique.
A is incorrect. Brainstorming is an elicitation technique that's useful for requirements gathering.
B is incorrect. Observation allows the stakeholder to actively or passively observe the work to
better understand the requirements of the solution.
D is incorrect. Prototyping allows the business analyst and team to create mockups of the
deliverable for solution testing and requirements approval.

Explanation
Voice mails are not appropriate for documenting the results of elicitation activities.
Answer D is incorrect. Written documentation is the preferred method for documenting the results of an
elicitation event.
Answer B is incorrect. Audio and video recordings are appropriate documentations of the elicitation event.
Answer A is incorrect. Whiteboards (actual or virtual) are approved methods for documenting elicitation
events.