Which of the following are internal qualities of a software product?

(A) Correctness, reliability, robustness, efficiency, usability
(B) Maintainability,  reusability, portability, interoperability
(C) Efficiency, usability, maintainability, reusability, portability
(D) Reusability, maintainability, reliability, robustness, efficiency

Answer: (D) Reusability, maintainability, reliability, robustness, efficiency