Alibaba Cloud Certified Associate (ACA) Practice Test

The primary use case for Alibaba Cloud's Object Storage Service (OSS) is indeed to store and serve static content. OSS is designed to handle large amounts of unstructured data, making it ideal for various types of static content such as images, videos, backups, and log files. Its architecture allows for high durability, availability, and scalability, which are essential for serving static resources efficiently over the internet.

Using OSS, users can leverage its capabilities to deliver files directly to users or applications without needing to manage servers or infrastructure. This is particularly beneficial for websites and applications that require fast access to media files or documents, enhancing user experience and reducing latency.

In contrast, other options such as hosting web applications, running complex machine learning models, and providing database services involve dynamic processing or complex data management that is outside the scope of what OSS is designed to do. Those services are typically handled by other Alibaba Cloud offerings, which are specialized for those specific tasks like Elastic Compute Service (ECS) for web applications, Alibaba Cloud Machine Learning Platform, and ApsaraDB for database services.