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Which important operational task should be performed after deploying a churn prediction model to production?
①Delete all training data and do not retrain.
②Keep the model fixed and do not make any changes.
③Manually perform the same action for all customers every time.
④Ignore all of the model's outputs and implement measures at random.
⑤Monitor prediction accuracy and changes in the input distribution in production, and if the model degrades, perform retraining.