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.

Explanation:
http://www.cisco.com/en/US/docs/security/ips/7.0/release/notes/18483_01.html Using manual upgrade:
If you want to manually update your sensor, copy the 7.0(1)E3 update files to the directory on the server that your sensor polls for updates.
When you upgrade the AIM IPS or the NME IPS using manual upgrade, you must disable heartbeat reset on the router before installing the upgrade. You can
reenable heartbeat reset after you complete the upgrade. If you do not disable heartbeat reset, the upgrade can fail and leave the AIM IPS or the NME IPS in an
unknown state, which can require a system reimage to recover.