The issue could have been avoided if the developer had used Sandbox testing (Option D), which allows new software to be tested in a controlled environment before implementation. This process ensures that the software does not negatively impact system functionality, like stopping access to critical resources such as file servers.
* End-user acceptance (Option A) ensures that users approve the software, but it wouldn't prevent the issue.
* Staff delegation (Option B) relates to who is responsible but doesn't address testing.
* Appropriate scoping (Option C) helps in defining the extent of changes but does not replace testing.
CompTIA A+ Core 2 References:
* 4.2 - Explain basic change management best practices, including testing in a sandbox environment.