【单选题】

What are the steps required to perform a Preservation install on a server?（）

A . Shutdown the server and boot it into SMS. Select SMS menu option OS Upgrade, Preservation install for the install type, and allow upgrade to run.
B . Shut down the server and perform a network boot from a local NIM server. Select Presevation install for the install type, and allow upgrade to run.
C . Shutdown the server and boot it into SMS. Select SMS menu option OS Upgrade, Presevation install for the install type, and allow for upgrade to run.
D . Re-boot the server and NFS mount the bos images from a local NIM server. Run smit install. Select Presevation install for the install type, and allow upgrade to run.