The purpose of their work is to verify the requirements. This is because verifying requirements is the process of ensuring that the requirements are correctly defined and documented according to the agreed standards and quality criteria. Verifying requirements can involve reviewing user requirements and high-level design flowcharts with the key stakeholders to check for errors, omissions, inconsistencies, or ambiguities. The other options are not as accurate or relevant as verifying requirements. References: BABOK Guide, section 4.2.3: Verify Requirements CCBA Practice Test, question 106