Node 1 in a clustered pair detects that it has lost connectivity to one of its disk shelves. Node 1 is still up, but it
cannot see one of its disk shelves. However, the partner node, Node 2, can see all of the Node 1’s disk
shelves. Which feature will cause Node 2 to monitor this error condition for a period of three minutes by default,
and then forcibly take over Node 1 if the error condition persists?

A.
Auto enable of giveback

B.
Negotiated Fail Over

C.
Takeover on panic

D.
cf.quickloop.enable

Explanation:
http://www.wafl.co.uk/cf/
http://wafl.co.uk/options/
Negotiated failover is a general facility which supports negotiated failover on the basis of decisions
made by various modules.
cf.takeover.on_disk_shelf_miscompare
This option allows negotiated takeover to be enabled
when the cluster nodes detect a mismatch in disk shelf
count. By default, this option is set to off.This option is available only when cluster is licensed
and changing the value on one filer automatically
changes the value on the partner filer.