An administrator is tasked with increasing the size of the volume /dev/vg/lv to 20GB. Which of the following BEST illustrates the steps the administrator should take? 

Answer options:

A. vgextend "L20G /dev/vg/lv; resizelv /dev/vg/lv
B. parted "L20G /dev/vg/lv; remount /dev/vg/lv
C. mkfs "L20G /dev/vg/lv; tune2fs /dev/vg/lv
D. lvextend "L20G /dev/vg/lv; resize2fs /dev/vg/lv

D