What requirements elicitation involves carefully selected stakeholders and subject matter experts for a short, intensive period (usually for one to a few days) to define and document the requirements

Many-to-many interviews are not a standard elicitation technique; interviews in business analysis are typically conducted one-on-one or in small groups, not as a mass-participation format.

Requirements workshops are a structured elicitation technique defined in the BABOK Guide in which a facilitator leads a time-boxed session - typically one to a few days - with a targeted group of stakeholders and SMEs. This intensive format accelerates consensus-building and produces documented requirements more efficiently than individual interviews spread over time.

A focus group gathers opinions and attitudes from a selected set of participants, and is more commonly used in marketing or user research rather than for formally defining and documenting solution requirements.

Prototyping involves building a working model or mock-up of the solution to solicit feedback, not a discussion-based session aimed at defining requirements from scratch.