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Correct answer: C. Nothing, since the setting applies to your entire account on every device
Explanation
The principle — data controls are a property of your account, not of the copy of the app in front of you.
Why the key is correct — OpenAI answers this question directly: once you turn off model training, the setting applies to your entire account, and it does not matter which device you are using.
Why the others are wrong — you do not repeat it per device, because it was never stored per device. No sign-out is needed to pull it down. And it is not reset by app updates, since a preference on your account is not part of an installed application.
Remember this — set it once. The same reasoning tells you where to check if you are ever unsure: settings on any device shows the account's current state, and you can change it at any time with no restrictions. It is also worth knowing what the setting does not cover — OpenAI notes that turning off memory and personalisation features does not disable safety features that may use limited, safety-relevant context in rare, high-risk situations.
Sources — OpenAI's Data Controls FAQ.
Sources
“Yes. Once you turn off model training, the setting applies to your entire account. It doesn't matter which device you're using.”
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