The correct answer is C. a and d are benefits, b and c are drawbacks. Here’s why: a) Independent testers can find different defects: This is a benefit. Independent testers bring a fresh perspective and can find defects that may have been overlooked by the development team. b) Developers may put less emphasis on quality: This is a drawback. If developers rely too heavily on an independent test team, they might not put enough emphasis on quality in the initial development stages. c) Independent testers can be seen as the reason for delayed projects: This is a drawback. If independent testing is not well-integrated into the development process, it can lead to delays. d) Independent testers can verify assumptions made during the specification of a system: This is a benefit. Independent testers can provide a valuable check on the assumptions made during system specification, helping to ensure that the system meets its intended requirements.

I believe is B because it matches the definition for a methodological approach to error guessing in the syllabus.