Discussion
Bringing up peripherals one at a time rather than all together is worth the effort because
Answer: D
Correct answer: a fault is then attributable to the one thing just changed
Bringing up one peripheral at a time keeps the number of possible causes at one. Enable six at once and a failure could come from any of them or from an interaction, and the search space is far larger than six. It is the same discipline as changing one variable at a time in an experiment, and it costs less time than it appears to.
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