An application uses DynamoDB tables for its data store. The application requires performing a write operation on a sequence of items, and roll back and reverse all operations in case of any faulty operation. What is the best method to accomplish this requirement?

Answer options:

A.DynamoDB does not support atomic transactions. Use relational database (such as RDS) that supports atomic transactions.
B.Use TransactWriteItems operation.
C.Use BatchWriteItem operation.
D.Update the application to manage and perform roll-back operations.

Answer: B
Option A is incorrect because DynamoDB supports atomic transactions.
Option B is CORRECT because DynamoDB transactions provide the ability to group multiple items into a single atomic transaction and perform all-or-nothing operation coordinated operations.This can be done programmatically using the TranactWriteItems operation.
Option C is incorrect because the BatchWriteItem operation does not guarantee that the actions will be performed on all items as a single atomic coordinated operation. It is possible that only some of the actions in the batch succeed while the others do not.
Option D is incorrect because this is not the ideal solution. It requires an application code change, and tracking all connected operations and reverse them as required is difficult to implement. Using the native transaction ability provided by DynamoDB is a better option.
Reference:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transaction-apis.html