Which category of software maintenance accounts for more than 50% of total maintenance costs, focusing on adding new features and enhancing performance?
Option C is correct. Software Maintenance Breakdown: Perfective (~50% - feature enhancements, performance optimization); Adaptive (~25% - environmental changes); Corrective (~20% - bug fixes); Preventive (~5% - refactoring).
Which software maintenance category involves modifying software to adapt to shifts in hardware platforms, OS upgrades, or updated database systems?
Option B is correct. Adaptive Maintenance alters software to ensure compatibility with evolving external operating environments (e.g., OS upgrades, database migrations).
Which software maintenance category focuses strictly on debugging and fixing reported software defects and logical crashes?
Option C is correct. Corrective Maintenance involves reactive bug fixing to resolve reported system failures, runtime errors, and specification deviations.
What software maintenance activity restructures internal code implementation without altering its external functional behavior to improve readability?
Option C is correct. Code Refactoring improves internal code quality, legibility, and architectural structure without changing the observable external application behavior.
In Software Reliability Engineering, what metric represents the mean average elapsed operational time between consecutive system failures?
Option A is correct. MTBF = MTTF + MTTR. It measures the mean operating time expected between successive system failures for repairable systems.