Which of the following artifacts is the business analyst's main responsibility?

Product scope defines the features, functions, and behaviors of the deliverable itself, and the business analyst is the key owner of this artifact, eliciting and documenting requirements that shape what the product must do. This distinguishes the BA's focus from the project manager, who owns project scope - the work required to deliver the product.

Project scope defines the work required to produce the deliverable and is primarily the responsibility of the project manager, not the business analyst.

The project charter is created by or for the project sponsor and authorizes the project; the business analyst does not own this document.

The business case justifies the investment in the project and is typically owned by the project sponsor or a business stakeholder, not the business analyst.