A live online game uses DynamoDB instances in the backend to store real-time scores of the participants as they compete against each other from various parts of the world. Which data consistency option is the most appropriate to implement?

Answer options:

A.Strongly consistent
B.Eventually consistent
C.Strong Eventual consistency
D.Optimistic consistency

Correct Answer – A
Since the gamers are from geographically distinct locations, the data will need to be immediately readable within a second as soon as it is written. Therefore strongly consistency is needed.
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadConsistency.html
Option B is INCORRECT because the scenarios outline that the participants of the game are live. It will not suffice if any of them get updates on scores in less than real-time.
Option C is INCORRECT because strong eventual consistency is not applicable in DynamoDB.Option D is INCORRECT because only two data consistency models are available with the DynamoDB service. Optimistic consistency is not supported.