An ed-tech company needs to deliver its video-on-demand (VOD) content to approximately 1 million users in a cost-effective way. The learning material is in the form of videos with a maximum size of 10 GB each. The videos are highly watched when initially uploaded and subsequently have very less views after 6-8 months. While the old videos might not be accessed regularly, they need to be immediately accessible when needed. With trainers and material doubling every few months, the number of videos has exploded over the last few months, dramatically increasing the cost of storage for the company. Which is the most cost-effective way of storing these videos to address the given use case?