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Correct answer: C. A read-only copy of the conversation, reachable by a link you send
Explanation
The principle — sharing produces a snapshot for other people to read, not access to your live conversation.
Why the key is correct — OpenAI describes Share as creating a link to a read-only copy of a conversation that you can send to others.
Why the others are wrong — the recipient cannot continue your thread, because they receive a copy. It is not a download, since exporting your data is a separate feature. And it is not listed anywhere browsable; the link is the only way in.
Remember this — a shared link is a copy that keeps working until you delete the link, which is a separate action from deleting the chat.
Sources — OpenAI's What is ChatGPT FAQ and the article on deleting a shared link.
Sources
“Yes. Use Share to create a link to a read-only copy of a conversation you can send to others.”
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