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？（）AtarBtctlCrmdevDbackup
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
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