A network administrator is completing an In-Service Software Upgrade (ISSU) for an Intelligent
Resilient Framework (IRF) virtual devices. The device has two members. Each member has one
management module. Member1 is currently the master. The administrator has initiated a rollback
time for this upgrade.
When should the administrator accept the upgrade?

A.
After upgrading both members of the IRF virtual device

B.
After checking the new software’s ISSU compatibility but before upgrading either member

C.
After upgrading member 1 but before switching over to and upgrading member 2

D.
After upgrading and switching over to member 2 but before upgrading member 1

Explanation:

Look here items 6-7
http://www.h3c.com/portal/Technical_Support___Documents/Technical_Documents/Switches/H3C_S12500_Series_Switches/Configuration/Operation_Manual/H3C_S12500_CG-Release7128-6W710/01/201301/772597_1285_0.htm