Answer C.
Clean room software engineering (CSE) is a process model that removes defects before they can precipitate serious hazards .It is a team-oriented, theory based software, which is developed using the formal methods, correctness verification and Statistical Quality Assurance (SQA). Clean room management is based on the incremental model of software development, which accumulates into the final product. The approach combines mathematical-based methods of software specification, design and correctness verification with statistical, usage-based testing to certify software fitness for use. The main goal of clean room engineering is to produce zero error-based software by allowing correct designs.