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Mount Everest is usually climbed in May, when weather conditions are safest. In September, only the most experienced climbers attempt the summit, and only when the weather is unusually calm.

Zane: Nims just uploaded a video of his Mount Everest summit, dated 15 September. He must be a very experienced climber.

John: “The video shows it was a calm day. It must have been in September.”

If the information in the box is true, whose reasoning is correct?