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AWS Certified Solutions Architect - Professional · AWS
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
A would have been the best answer if resilient internet access for private instances is the goal here. However, the question already states that "the company’s security team is bringing only one IP address from its internal IP address range to the cloud". Therefore, C becomes the only suitable answer.
Option C is best. As there is only one IP address that can be used Option A = 3 NAT gateways are not needed.
This question is little unclear. It does not state whether the communication between on-premise system and AWS is out bond or in bound in nature. If it is outbound then C makes sense.