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Which is a supported method to upgrade firmware on an I……

Which is a supported method to upgrade firmware on an IBM Power Systems 570?()

A.Use the /usr/sbin/invscout AIX command
B.Use the 'Updates' panel on the managing HMC
C.Boot the 570 using an IBM-provided microcode CD
D.Use the /usr/lpp/diagnostics/bin/update_flash AIX command