During a short maintenance window, several blade servers in one c7000 need firmware updates.
What is an efficient method of updating multiple servers at the same time?

A.
Use the ISO file on a USB key plugged into the internal server USB port.

B.
Use an ISO file on a USB key plugged into the OA.

C.
Use USB key utility to build bootable media plugged into the OA

D.
Use USB key utility to build bootable media plugged into the dongle.

Explanation:
http://h10032.www1.hp.com/ctg/Manual/c00814176.pdf (page 8, enclosure DVD)