You are designing a Windows Azure application that will store data. You have the following requirements：  
- The data storage system must support the storage of more than 500 GB of data.  
- Data retrieval must be possible from a large number of parallel threads without threads blocking each other.  
You need to recommend an approach for storing data. 
What should you recommend？（）

A. Use Windows Azure Queues.
B. Use Windows Live Mesh 2011.
C. Use a single SQL Azure database.
D. Use Windows Azure Table storage