The same EC2 instance can cost very different amounts depending on how you buy it. Cost-optimized architectures match each workload to the right purchase option: flexibility where the future is uncertain, commitment where usage is steady, spare capacity where work can be interrupted, and dedicated hardware only where licensing or compliance requires it. The exam gives you a workload description and asks for the cheapest option that still meets the requirements, so read carefully for words like 'steady', 'interruptible', 'short-term' and 'licensed per core'.
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