Which advantage does Amazon S3 Glacier provide for data storage?

Amazon S3 Glacier is designed specifically for long-term data archiving at a low cost. Its primary advantage is its ability to store large amounts of data for long periods at a fraction of the cost compared to traditional storage solutions. This makes it an ideal choice for data that is infrequently accessed but must be retained for compliance, legal, or other reasons. The tiered pricing model further supports cost efficiency, allowing businesses to manage their storage expenses effectively while ensuring that archived data remains accessible when needed.

The other options describe features that are not aligned with the primary purpose of S3 Glacier. Immediate retrieval of archived data and high-speed access are characteristics more suited to other AWS storage solutions, such as Amazon S3 Standard. Additionally, real-time analytics capabilities are not a feature of S3 Glacier; instead, users typically utilize other services in conjunction with their archived data to perform analytical tasks. Thus, B is the most accurate representation of Amazon S3 Glacier's advantage in the context of data storage.