A. OSS + CDN combination Explanation: OSS (Object Storage Service): Alibaba Cloud OSS is a scalable and secure object storage service. It is suitable for storing and retrieving large amounts of unstructured data, such as images. You can use OSS to store the 10GB of images and handle the additional 50GB of image content uploaded weekly. CDN (Content Delivery Network): CDN is used to accelerate the delivery of static content, such as images and JavaScript files, by caching them at various edge locations. This helps in reducing latency and improving the loading speed for users located around the world. CDN can be used in conjunction with OSS to improve the performance of delivering images and scripts to users. Therefore, the combination of OSS for storage and CDN for content delivery is a suitable solution to address both the storage and performance issues in this scenario.

one single ECS instance is used to host all the application content as well as a MySQL database. --- This should be separated.

A. OSS + CDN combination Combining OSS for scalable storage and CDN for efficient content delivery will address both the storage and performance issues while accommodating the growing user demands and image content. OSS (Object Storage Service): You can use OSS to store and manage the 10GB of existing images and the additional 50GB of image content that will be uploaded every week. OSS provides scalable, reliable, and cost-effective storage for large amounts of data, making it ideal for storing images. CDN (Content Delivery Network): CDN can significantly improve the performance of delivering images and other static assets to users. By caching these assets on CDN edge servers distributed globally, it reduces the load on your ECS instance and enhances the user experience by serving content from the nearest edge location. This helps in alleviating the slow loading of images and improves overall portal responsiveness.

A. OSS + CDN Use CDN to accelerate access to OSS When you access Object Storage Service (OSS) resources, the access speed depends on the region in which the buckets are located and is limited by the downstream bandwidth of OSS. Alibaba Cloud Content Delivery Network (CDN) provides higher bandwidth. If you use CDN to access OSS resources, CDN caches the resources on CDN nodes closest to your region and distributes the resources to you from the nodes. This way, you can access OSS resources more quickly at lower costs.

The use of CDN is obviously the answer.

AAAAA CDN is the key