Constraint ranking is a type of requirements prioritization that considers the limitations or restrictions that affect the solution. Laws and regulations are examples of constraints that must be met by the solution. Therefore, ranking the requirements according to the relevant laws is a constraint ranking method. References: Business Analysis Expert Certification, CCBA® | IIBA®, section "CCBA Competencies" Certification of Capability in Business Analysis (CCBA®) Handbook, page 5, section "4. Review the Exam Blueprint"