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An application keeps a multi-turn chat with Claude. When it sends the fourth user turn to the Messages API, what must the request body contain?
A
A short summary of the earlier turns; full history is accepted only on the first request of a conversation
B
Only the newest user message, because the service stores the earlier turns under a conversation ID
C
The newest user message plus the ID of the previous response, which the service expands server-side
D
The complete ordered conversation history — every previous user and assistant turn — followed by the new user message