You have the following requirements：  
- Ensure that the business tier can be updated without affecting the application tier.  
- Use the minimum role instance size that meets or exceeds the current server specifications.   
You need to recommend a topology for hosting the application in Windows Azure. 
What should you recommend？（）

单项选择题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

单项选择题You are designing an upgrade strategy for a Windows Azure application that includes one web role with one instance.  You have the following requirements：   - Test the application on the Windows Azure platform.   - Ensure that application upgrades can be rolled back.   - Ensure that upgrade and rollback processes do not cause downtime.    You need to recommend an approach for upgrading the application.  What should you recommend？（）

A. Deploy to the Production slot.  Test the application， and then perform a VIP swap.
B. Deploy to the Staging slot.  Test the application， and then perform a VIP swap.
C. Deploy to the Staging slot.  Test the application， and then perform a manual in-place upgrade to the Production slot.
D. Deploy to the Staging slotTest the application， and then perform an automatic in-place upgrade to the Production slot.

单项选择题You are designing a Windows Azure application.   The application contains one web role and three worker roles.  You need to recommend an approach for updating only one role without interrupting the other roles.   What should you recommend？（）

A. Perform a VIP swap.
B. Perform an in-place upgrade.
C. Delete the current deployment and then redeploy the application.
D. Copy the cloud package to blob storage and then restart the service.

单项选择题You are planning an upgrade strategy for a Windows Azure application.  You need to identify changes that will require application downtime.  Which change will always require downtime？（）

A. Changing the virtual machine size
B. Adding an HTTPS endpoint to a web role
C. Changing the value of a configuration setting
D. Upgrading the hosted service by deploying a new package

单项选择题An application has been migrated to the Windows Azure platform.  The application references a native x86 DLL.  The DLL source code is not available.   The application displays an error when loading the DLL.   You need to recommend an approach for ensuring that the application can load the DLL.  What should you recommend？（）

A. Create a 32bit application to host the DLL.
B. Modify the application to allow unsafe code.
C. Modify the application to call methods in the DLL.
D. Modify the application to target the x86 platform.