单选题A system administrator has been asked to migrate the dev_vg volume group from server A to server B. The dev_vg volume group contains a single filesystem named "/development". To prepare for migration， which of the following is the correct sequence of commands for removing the volume group from server A？（）Aexportvg dev_vg； umount /development； varyoffvg dev_vgBvaryoffvg dev_vg； umount /development； exportvg dev_vgCumount /development； exportvg dev_vg； varyoffvg dev_vgDumount /development； varyoffvg dev_vg； exportvg dev_vg
单选题
A system administrator has been asked to migrate the dev_vg volume group from server A to server B. The dev_vg volume group contains a single filesystem named "/development". To prepare for migration， which of the following is the correct sequence of commands for removing the volume group from server A？（）
A
exportvg dev_vg； umount /development； varyoffvg dev_vg
B
varyoffvg dev_vg； umount /development； exportvg dev_vg
C
umount /development； exportvg dev_vg； varyoffvg dev_vg
D
umount /development； varyoffvg dev_vg； exportvg dev_vg
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