Which statement about Allocation Units is incorrect?

Which statement about Allocation Units is incorrect?

A.
Every Oracle ASM disk is divided into allocation units (AUs)

B.
An AU is the fundamental unit of allocation within a disk group,

C.
A file extent consists of one or more AUs.

D.
The au size disk group attribute can have the following values; 1, 8, 16, 32, 64, or 128 MB.

Explanation:
When you create a disk group, you can set the Oracle ASM allocation unit size with the AU_SIZE disk
group attribute. The values can be 1, 2, 4, 8, 16, 32, or 64 MB, depending on the specific disk group
compatibility level. Larger AU sizes typically provide performance advantages for data warehouse
applications that use large sequential reads.

http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmcon.htm#OSTMG94061