Amazon Glacier is the correct service for archiving large sets of infrequently accessed data due to its low cost and reliable long-term storage capabilities. Glacier is designed for data archiving, offering options that balance retrieval times with cost. Amazon S3 Standard is not the best choice for archival purposes because it is designed for frequently accessed data and comes at a higher cost. Amazon EFS and Amazon EBS are file and block storage services designed for active workloads, not for low-cost, infrequently accessed long-term data storage.