Which three statements apply to the SnapMirror visibility_interval argument? (Choose three.)

A.
The default interval value is five minutes.

B.
The smallest interval value supported is 30 seconds.

C.
This variable controls the view of the data on the destination system.

D.
By setting a value, you specify the amount of time before an automatic snapshot is created on
the source volume that is synchronously mirrored.

Explanation:
http://www.netapp.com/us/media/tr-3326.pdf
http://backdrift.org/man/netapp/man5/na_snapmirror.conf.5.html
http://hd.kvsconsulting.us/netappdoc/733docs/html/ontap/onlinebk/GUID-47724B21-7C7E-4AC9-A497-9505B42C27AF.html
With SnapMirror Sync and SnapMirror Semi-Sync, changes to the source volume do not show
upimmediately on the destination volume, even though the changes have been replicated. The
changesare first shown after the source system creates an automatic Snapshot copy of the source
volume.
Snapshot copies created on the source volume are immediately propagated to the destination
volume. Theautomatic Snapshot copies are created every three minutes by default.
To change the interval for automatic Snapshot copies, change the visibility_interval in the
snapmirror.conf file; however, performance can degrade if set to a smaller interval because
frequent
Snapshot copies cause additional processing such as cache consistency checking on the
destination system.
There is also a disadvantage in setting this to a large value. When the connection between the
systems has anoutage and SnapMirror goes into asynchronous mode, SnapMirror uses the last
common Snapshot copy totransition into synchronous mode. This means that all data from the last
valid common Snapshot copy will needto be replicated from the source to the destination storage
system. If the visibility_interval is set to alarge value, a large amount of data might have to be
transferred and itmight take longer time for SnapMirror totransition into synchronous mode. For
these reasons, keep the default value of three minutes.
visibility_interval
The value for this argument is a number optionally followed by the suffixes: s (seconds), m
(minutes) or h(hours). If a suffix is not specified, value is interpreted as seconds. This argument
controls the amount of timebefore an automatic snapshot is created on the source volume that is
synchronously mirrored. The value is thenumber of seconds between automatically created
snapshots. The default value is 3 minutes. A small numberhere can negatively affect the
performance of the mirror. This argument is ignored for asynchronous mirrors.

visibility_interval={xs | xm | xh}
Determines the amount of time before an automatic Snapshot copy is created on the source
volume that isbeing replicated using synchronous or semi-synchronous SnapMirror. When
replicating synchronously or semisynchronously,using SnapMirror, changes to the source volume
do not show immediately on the destinationvolume, even though the changes have been
replicated. The changes are shown only after the source systemtakes an automatic Snapshot
copy of the source volume. This event occurs every three minutes by default.
You can change the interval for automatic Snapshot copies, but performance can degrade if you
set smallerintervals because Snapshot copies are taken more often. The smallest interval you can
set is 30 seconds.
Note: The s, m, and h suffixes specify seconds, minutes, and hours, respectively.