what must be performed before installing the upgrade?

When upgrading a Cisco IPS AIM or IPS NME using manual upgrade, what must be performed before installing the upgrade?

A.
Disable the heartbeat reset on the router.

B.
Enable fail-open IPS mode.

C.
Enable the Router Blade Configuration Protocol.

D.
Gracefully halt the operating system on the Cisco IPS AIM or IPS NME.