Which two considerations should an integration architect make when building a scalable integration solution?

Northern Trail Outfitters needs to make synchronous callouts "available to promise” services to query product availability and reserve inventory during customer checkout process.

Which two considerations should an integration architect make when building a scalable integration solution? Choose 2 answers
A . The typical and worst-case historical response times.
B. The number batch jobs that can run concurrently.
C. How many concurrent service calls are being placed.
D. The maximum query cursors open per user on the service.

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Answer: B,D