You have a computer that runs Windows Vista. You install Windows 7 on a new partition on the computer.You need to ensure that the computer always starts Windows Vista by default.  What should you do?（）

• A、Run Bcdedit.exe and specify the /default parameter.
• B、Run Bcdedit.exe and specify the /bootems parameter.
• C、Create a boot.ini file in the root of the Windows 7 partition.
• D、Create a boot.ini file in the root of the Windows Vista partition.