You need to upgrade the firmware on 15 Cisco UCS C-Series Rack Servers. Ten of the servers are integrated in a Cisco UCS

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You need to upgrade the firmware on 15 Cisco UCS C-Series Rack Servers. Ten of the servers are integrated in a Cisco UCS cluster, and the other five servers are used in standalone mode. The Cisco UCS C-Series Rack-Mount Server Software Bundle is available.
Which set of statements about the upgrade process is true?

A. You cannot upgrade the firmware on the servers in standalone mode. You must cluster the servers first over LAN or via cluster interfaces. After the firmware upgrade, you can revert the five servers to standalone mode.
B. You cannot use the Cisco UCS C-Series Rack-Mount Server Software Bundle with Cisco UCS C-Series Servers in standalone mode. You must download and use the Cisco UCS C-Series Rack-Mount Standalone Server Software package.
C. First, you must integrate the standalone servers into the Cisco UCS system. Then, you can upgrade the firmware on all 15 servers from Cisco UCS Manager. Finally, you can revert the five servers to standalone mode.
D. You can upgrade the firmware on all of the Cisco UCS C-Series Rack Servers by using the Cisco UCS C-Series Rack-Mount Standalone Server Software. You