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