Which ASM_DISKSTRING parameter would perform the best by searching the fewest number of devices for ASM discovery?

The storage administrator is adding several disks to a pool of ASM disks. The current
ASM_DISKSTRING parameter is “/dev/sda*”, /dev/sdb*, /dev/sd*6″. There are several hundred
disk partitions currently.
The new disks are /dev/sdf1, /dev/sdg1, /dev/sdh1, and /dev/sdd6.
Which ASM_DISKSTRING parameter would perform the best by searching the fewest number of
devices for ASM discovery?

A.
ASM_DISKSTRING=”/dev/sda*�, “/dev/sdb*”, �/dev/sd*6″,�/dev/sd*1″

B.
ASM_DISKSTRING=”/dev/sda*�, “/dev/sdb*”, �/dev/sd*6″,�/dev/sd*”

C.
ASM_DISRSTRING=”/dev/sd*”

D.
ASM_DISKSTRING=””

E.
ASM_DISKSTRING=”/dev/sda*”, “/dev/sdb*”, “/dev/sd*6”, “/dev/sdf1”, “/dev/sdg1”, “/dev/sdh1”

Explanation:
Improving Disk Discovery Time
The value for the ASM_DISKSTRING initialization parameter is an operating systemdependent
value that Oracle ASM uses to limit the set of paths that the discovery process uses to search for
disks. When a new disk is added to a disk group, each Oracle ASM instance that has the disk
group mounted must be able to discover the new disk using its ASM_DISKSTRING.
Oracle Automatic Storage Management Administrator’s Guide
11g Release 2 (11.2)