Which of the following statements are true? Choose one:
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When not being used, a 5-1/4" disk should be kept in its protective sleeve
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A hard drive should be protected from high magnetic fields
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A surge suppresser can help to protect a computer installation from high voltage spikes
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When cleaning PC boards, blowing dust away is preferred over vacuuming
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All of the above
Statement A is true (floppy disks require sleeves for protection). B is true (hard drives are magnetically sensitive storage devices). C is true (surge suppressors protect against voltage spikes). D is true (vacuuming can generate static; compressed air is safer for PC boards). Therefore, all statements are correct.
All four statements are individually true, accepted PC maintenance/handling practices: unused 5.25" floppy disks should stay in their protective sleeves to avoid scratches/contamination; hard drives should be kept away from strong magnetic fields that can corrupt stored data; surge suppressors protect equipment from voltage spikes; and blowing dust away (with compressed air) is generally preferred over vacuuming for PC boards due to static risk. Since every individual statement holds, 'All of the above' is the most complete correct choice rather than any single one alone.