How many ASM Disk Group(s) do you need, if you want to have the redundancy level set to high (triple mirroring) for a FILE?

How many ASM Disk Group(s) do you need, if you want to have the redundancy level set to high
(triple mirroring) for a FILE?

A.
1

B.
2

C.
3

D.
It depends on the number of different disks in a Disk Group, not the number of Disk Groups.

Explanation:
If you want ASM to mirror files, you specify the redundancy level as NORMAL REDUNDANCY (2-way
mirroring by default for most file types) orHIGH REDUNDANCY (3-way mirroring for all files). You
specify EXTERNAL REDUNDANCY if you do not want mirroring by ASM. For example, you might
choose EXTERNAL REDUNDANCY if you want to use storage array protection features.

http://docs.oracle.com/cd/B28359_01/server.111/b31107/asmdiskgrps.htm#OSTMG10202