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Correct answer: A. Projects are available on any plan, but you must be signed in
Explanation
The principle — projects are not a paid tier feature, but they are an account feature.
Why the key is correct — OpenAI states that projects are available to all free and paid subscription types globally, and separately that you must be logged in to a ChatGPT account in order to use projects.
Why the others are wrong — no subscription is required, since availability spans every type. Signed-out use covers ordinary conversation only, because a project has to persist files and instructions. And personal accounts can create them; sharing with colleagues is what the business tiers add.
Remember this — free accounts get projects. What paying changes is how many files each project can hold.
Sources — OpenAI's Projects in ChatGPT article.
Sources
“Projects are available to all free and paid subscription types globally.”
“Note: You must be logged in to a ChatGPT account in order to use projects.”
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