Which single command simulates a failed device within a RAID 5 array?

A. mdadm –remove /dev/md0 /dev/sdd1
B. mdadm –zero-superblock /dev/sdf3
C. mdadm –force-fault /dev/md2 /dev/sde2

D. mdadm –fail /dev/md0 /dev/sdc1

E. mdadm /dev/md0 –offline /dev/sdc1