单选题A system administrator wants to automatically eject the backup tape each night after the backup is complete. Which command can be used to eject the tape？（）A tarB tctlC rmdevD backup
题目
单选题
A system administrator wants to automatically eject the backup tape each night after the backup is complete. Which command can be used to eject the tape？（）
A
tar
B
tctl
C
rmdev
D
backup