Correct Answer: To adjust the size of the logical volume to approximately 290M, follow these steps: First, unmount the logical volume using `umount /dev/vg0/vo`. Next, use the `lvresize` command to resize the logical volume by specifying the target size, e.g., `lvresize -L 290M /dev/vg0/vo`. After this, if you're dealing with an EXT4 file system, run `resize2fs /dev/vg0/vo` to resize the file system inside the logical volume. Finally, remount the logical volume using `mount /dev/vg0/vo [mount_point]`. Verify the changes using `df -hT` to ensure the logical volume size is now approximately 290M and that the volume is correctly mounted. The range of 270M to 320M is acceptable.