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