What is the most cost-effective solution?

A travel website needs to present a graphical quantitative summary of its daily bookings to website visitors for marketing purposes. The website has millions of visitors per day, but wants to control costs by implementing the least-expensive solution for this visualization.

What is the most cost-effective solution?
A . Generate a static graph with a transient EMR cluster daily. And store it in Amazon S3
B . Generate a graph using MicroStrategy backed by a transient EMR cluster
C . Implement a Jupyter front-end provided by a continuously running EMR cluster leveraging spot instances for task nodes
D . Implement a Zeppelin application that runs on a long-running EMR cluster

Answer: A