The Trial-And-Error Method Should NOT Be Used Under Which of the Following

Multiple Choice

The trial-and-error method should NOT be used under which of the following situations?

A) Whatever change you're about to make can be undone easily.
B) The system the change is being applied to is new, so no chance of data loss.
C) The server is your public Web server and is currently hosting all of your business.
D) System is an isolated machine in a test lab.