A digital audio platform sells custom ringtones created from snippets of trending music. These ringtone files are stored in Amazon S3 Standard and are each at least 256 KB in size. The platform hosts millions of these files, but downloads are uncommon for any ringtone that is more than 120 days old. The company wants to reduce its storage costs while keeping frequently accessed ringtones immediately available to users. What is the MOST cost-effective way to meet these requirements?