Which of the following describes corrective maintenance?

Corrective maintenance specifically refers to the actions taken to repair equipment or systems after a failure has occurred or a problem has been identified. This type of maintenance is reactive in nature, meaning it responds to breakdowns or issues that disrupt normal operations. When problems arise, corrective maintenance addresses them by diagnosing the issue, executing repairs, and restoring functionality.

The other options describe forms of proactive maintenance. Routine checks and services, monthly cleaning schedules, and scheduled inspections are all designed to prevent problems before they happen and keep equipment in optimal working condition. Each of these practices plays an essential role in an overall maintenance strategy aimed at prolonging equipment life and ensuring operational efficiency. However, they do not fall under the category of corrective maintenance, which is solely focused on responding to incidents that require immediate attention after they occur.