Comprehensive and Detailed This is anon-functional requirementbecause it specifiesperformance constraints (portal response time) rather than functionality. BABOK Guide (Chapter 5.3 - Specify and Model Requirements)states that non-functional requirementsdefine constraints on system performance, security, usability, and reliability. Transitional requirements (Option B)cover temporary needs during system migration. Stakeholder requirements (Option C)describe what stakeholders need but do not specify performance. Functional requirements (Option D)define system behaviors but not performance constraints.