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 c

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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？（）

exportvg dev_vg； umount /development； varyoffvg dev_vg

varyoffvg dev_vg； umount /development； exportvg dev_vg

umount /development； exportvg dev_vg； varyoffvg dev_vg

umount /development； varyoffvg dev_vg； exportvg dev_vg

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A system administrator has been asked to migrate the dev_vg

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