Which file should you review to gather more information about the failure?

You have attempted to upgrade a VPLEX system to the latest Geosynchrony code. During the upgrade, an error appeared and caused the upgrade to fail.

Which file should you review to gather more information about the failure?
A . firmware.log_<date>
B . session.log
C . VPlexconfiguration-session.txt
D . ndu-pre-check-stderr.txt

Answer: A