You are designing a strategy for synchronizing a SQL Azure database and multiple remote Microsoft SQL Server 2008 databases. 
The SQL Azure database contains many tables that have circular foreign key relationships.  You need to recommend an approach for ensuring that all changes in the remote databases synchronize with the SQL Azure database. 
What should you recommend？（）

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？（）