What is the monthly charge for using the public data sets?

Amazon EC2 provides a repository of public data sets that can be seamlessly integrated into AWS cloud-based applications.

What is the monthly charge for using the public data sets?
A . A 1 time charge of 10$ for all the datasets.
B . 1$ per dataset per month
C . 10$ per month for all the datasets
D . There is no charge for using the public data sets

Answer: D