问题：

[单选]

You are migrating a solution to Windows Azure.  
The solution includes a web application and a business logic layer.  The web application runs on three dual-core servers.  The business logic layer runs on two quad-core servers.  
The Windows Azure application must match or exceed the current hardware specifications.  You need to recommend role instance sizes that minimize cost. 
What should you recommend？（）

A .  Small for the web application and Medium for the business logic layer
B .  Small for the web application and Large for the business logic layer
C .  Medium for the web application and Large for the business logic layer
D .  Large for the web application and Extra Large for the business logic layer