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For a new unpredictable traffic web application using Amazon EC2 and DynamoDB, which DynamoDB configuration offers the most cost-effective scalability for moderate to high throughput?
A
Provisioned capacity with DynamoDB Standard table and auto-scaling.
B
On-demand mode with DynamoDB Standard table.
C
Provisioned capacity with DynamoDB Standard-IA table and auto-scaling.
D
On-demand mode with DynamoDB Standard-IA table.
