单选题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.
单选题
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.
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