Which of the following is a maintenance type?

• A. All of the above
• B. Emergent
• C. Preventative
• D. Corrective

Answer: (A)

Maintenance in information systems covers different types of work aimed at keeping systems functioning and reliable. Emergent maintenance is urgent, unplanned work to restore service quickly after an unexpected disruption. Preventive maintenance consists of scheduled tasks designed to prevent failures and extend system life. Corrective maintenance fixes issues after a fault has occurred to restore normal operation. Since each of these is a recognized maintenance type, the option stating all of the above is the best answer.