Suitability, Accuracy, Interoperability, and security are what type quality attribute of ISO 9126 ?

A. Reliability
B. Efficiency
C. Functionality
D. Usability
✅ The correct answer is option C.
Explanation: All the Characteristics mentioned in the question are related to achievement of the basic purpose for which the software is being engineered, which is functionality.

Inspections and testing are what kinds of Quality Costs ?

A. Prevention
B. Internal Failure
C. External Failure
D. Appraisal
✅ The correct answer is option D.
Explanation: Inspections, equipment calibration, maintenance and testing appraisal costs is quality management.