You have an application with the following requirements:

7. There will be a lot of video content that need to be uploaded.

2. Each uploaded video needs to be preprocessed to provide different video resolutions and quality levels to accommodate different devices and network conditions.

3. It should be possible to process video in parallel at scale, to ensure that videos are preprocessed in a reasonable amount of time.

Which of the following Alibaba Cloud applications can be combined to provide a low operation and maintenance burden and relatively low operating costs? (Number of correct answers: 3)