A team wants to reduce cost on a workload where the same 8,000-token clinical guidelines document prefixes every request, but a request ID is currently inserted at the very top for tracing. Select the TWO changes needed.

Answer: A and B — Move the request ID after the cache checkpoint / Place a cache checkpoint after the guidelines document

Both are required and neither works alone. The checkpoint has to exist, and the volatile request ID must sit after it — a changing value before the checkpoint invalidates the cache on every single call, silently.