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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. DB engine not same - nope. B. Fails HA. D. DocumentDB has no on-demand capacity "mode". It does have serverless, this is a misdirect. DocumentDB as of DEC2025 does have on-demand "instances" "pricing" model - key work instances + pricing > its not a "mode" but a billing feature. There is no "mode" setting to you set. AWS best practice migration = right sized unless specific scaling is required. C = Yes.
Option C is correct because it uses Amazon DocumentDB, which is compatible with MongoDB and supports multi-AZ high availability. This allows the application to be migrated without any code changes. The Java backend is hosted on EC2 with Auto Scaling across multiple AZs, providing HA at the compute layer. It meets all requirements and minimizes operational overhead.
C: DocumentDB has an on-demand instance type but NO on-demand capacity mode. Note the difference between the two: On-demand instance type is specific to EC2 pricing for hourly or per-second compute capacity. On-demand capacity mode is specific for DynamoDB and Kinese for pay-per-request pricing and no up-front capacity planning.