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The Software Development Life Cycle (SDLC) is essential for a security officer because it provides a clear way to ensure security is included in software from the start. The SDLC has a few different phases: planning, design, development, testing, deployment, and maintenance. By following these steps, a security officer can ensure the system is designed with security in mind, rather than fixing issues after the software is running. Identifying security requirements early helps prevent serious weaknesses in the system. This approach saves time, reduces risk, and keeps the organization safe. The SDLC also ensures that security testing happens before deployment so that any vulnerabilities can be found and fixed. Overall, the SDLC allows the security officer to stay involved throughout the entire process, helping to protect both the software and the organization by ensuring risks are addressed early and security measures remain consistent.