Discussion
What does the rule "20-20-20" stand for ?
Answer: C
The rule calls for 20 seconds of screen break.
The 20-20-20 rule is advice for preventing digital eye strain: every 20 minutes of screen work, look at something about 20 feet away for at least 20 seconds. Refocusing on a distant object relaxes the eye muscles that are held contracted for near work.
The rule is not about sleep, exercise or holidays. Those options simply reuse the number 20 with unrelated units.
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