Optiméa delivers three laboratory analysers to a clinic on 1 October 20X1 for a 90-day trial period. The clinic only commits to pay at the end of the trial and can return the devices free of charge during that period. It uses them from delivery. The trial expires on 30 December 20X1; at that date, the clinic has neither expressly accepted nor returned the devices. When does Optiméa recognise revenue?
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