Discussion
Arrange the steps of diagnosing a scaling problem in order.
1. address the shared bottleneck or add instances accordingly
2. establish which resource saturates first under load
3. verify with a load test that the limit has moved
4. determine whether it is per instance or shared
Answer: C
Adding instances without knowing what saturates is guesswork and often makes a shared bottleneck worse. The verification step is what confirms the diagnosis was right. Skipping it leaves you unable to say whether the change helped or merely coincided.
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