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 up
immediately 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. The
automatic 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 an
outage and SnapMirror goes into asynchronous mode, SnapMirror uses the last common Snapshot copy to
transition into synchronous mode. This means that all data from the last valid common Snapshot copy will need
to be replicated from the source to the destination storage system. If the visibility_interval is set to a
large value, a large amount of data might have to be transferred and it might take longer time for SnapMirror to
transition 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 time
before an automatic snapshot is created on the source volume that is synchronously mirrored. The value is the
number of seconds between automatically created snapshots. The default value is 3 minutes. A small number
here 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 is
being 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 destination
volume, even though the changes have been replicated. The changes are shown only after the source system
takes 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 smaller
intervals 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.