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A recently installed application update caused a vital application to crash during the middle of the workday. The application remained down until a previous version could be reinstalled on the server, and this resulted in a significant loss of data and revenue. Which of the following could BEST prevent this issue from occurring again?
Correct Answer: D
Explanation/Reference: Explanation: Patch management is the process of maintaining the latest source code for applications and operating systems by applying the latest vendor updates. This helps protect a system from newly discovered attacks and vulnerabilities. A part of patch management is testing the effects of vendor updates on a test system first to ensure that the updates do not have detrimental effects on the system, and, should the updates have no detrimental effects on the test systems, backing up the production systems before applying the updates on a production system.