Your server has a ZFS storage pool that is configured as follows: 
The server has two spare 146-GB disk drives: c3t5d0 c3t6d0
You need to add more space to the pool1 storage pool. Which command would add more mirrored
storage to the pool1 storage pool?
A.
zpool add pool1 mirror c3t5d0 c3t6d0
B.
zpool attach pool1 mirror c3t5d0 c3t6d0
C.
zpool attach pool1 c3r3d0 c3r5d0; zpool attach pool1 c3r4d0 c3r6d0
D.
zpool add pool1 c3r3d0 c3r5d0; zpool add pool1 c3r4d0 c3r6d0
A
A is correct
root@s11:~# format
Searching for disks…done
AVAILABLE DISK SELECTIONS:
0. c1t0d0
/pci@0,0/pci8086,2829@d/disk@0,0
1. c2t0d0
/pci@0,0/pci1000,8000@16/sd@0,0
2. c2t1d0
/pci@0,0/pci1000,8000@16/sd@1,0
3. c2t2d0
/pci@0,0/pci1000,8000@16/sd@2,0
4. c2t3d0
/pci@0,0/pci1000,8000@16/sd@3,0
Specify disk (enter its number): ^D
root@s11:~# zpool create pool1 mirror c2t0d0 c2t1d0
root@s11:~# zpool status pool1
pool: pool1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
pool1 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c2t0d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
errors: No known data errors
root@s11:~# zpool add pool1 mirror c2t2d0 c2t3d0
root@s11:~# zpool status pool1
pool: pool1
state: ONLINE
scan: none requested
config:
NAME STATE READ WRITE CKSUM
pool1 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c2t0d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
c2t2d0 ONLINE 0 0 0
c2t3d0 ONLINE 0 0 0
errors: No known data errors
A.