Which of the following BEST ensures that effective change management is in place in an...

Access to production source and object programs is the best way to ensure that effective change management is in place in an IS environment, as it prevents unauthorized or accidental changes to the production code that could affect the functionality, performance, or security of the system. Access to production source and object programs should be restricted to authorized personnel only, and any changes should follow a formal change management process that includes documentation, approval, testing, and review.

References

ISACA CISA Review Manual, 27th Edition, page 254

Change Management Best Practices for the Engineering and …

Change Management - an overview | ScienceDirect Topics