The answer is pulling on the plug. Milady's electrical-safety guidance is specific: "Disconnect appliances by pulling on the plug, not on the cord." This question is topic-tagged Sanitation in FadeJunkie's bank, but the underlying fact actually comes from Milady's electrical-safety chapter — pulling a cord repeatedly can fray or damage the wiring inside, creating a real shock or fire hazard over time.
Twisting the plug, pulling the cord, and stepping on the cord — the other choices — are all either ineffective or actively unsafe. This pairs directly with the "don't touch metal on a live appliance" rule below; both are part of the same basic shop electrical-safety discipline.
Milady Standard Barbering, 6th ed., Ch. 8 (Basics of Electricity), p. 211: "Disconnect appliances by pulling on the plug, not on the cord."
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