The correct option is Keep the follow-ups in the same ongoing chat so Copilot can use prior messages for context.

Copilot Chat builds its responses from the active conversation and the relevant code context, so keeping related questions in one continuous thread lets it leverage the earlier discussion and the surrounding repository context. This approach preserves continuity and reduces repeated prompting because the conversation history remains available to the assistant.

Start a new chat for each follow-up so Copilot generates fresh suggestions without past context is incorrect because opening a separate chat discards the prior conversation and forces the assistant to work without the useful context established earlier.

Integrate Vertex AI Search to index previous chats so Copilot retains context across sessions is incorrect because Vertex AI Search is a separate Google Cloud product and it is not used by Copilot Chat to maintain or recall chat history. Copilot Chat relies on the active thread and its own supported context sources rather than external indexing tools for conversation memory.

Depend on Copilot to remember conversations across different repositories and projects for later use is incorrect because Copilot Chat does not provide persistent memory across repositories or projects. Context is limited to the current conversation and the code or files in scope.

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