You are designing a Windows Azure application that will allow for the processing of image files. Images will be processed in batches by remote applications running on multiple servers.  The application must meet the following requirements：  
- Remain operational during batch-processing operations. - Allow users to roll back each image to previous versions.   
Each remote application must have exclusive access to an image while processing it. You need to recommend an approach for storing the images. 
What should you recommend？（）

You are designing a web service that will be hosted in Windows Azure. 
The web service will accept and store structured and semi-structured data. The web service must meet the following requirements：  
- Update all data within a single transaction. 
- Enforce the data structure for structured data within the data store.   
You need to recommend an approach for storing the data. 
What should you recommend？（）