What tasks must be completed to accomplish this?

Assume you need to make the third menu entry of your GRUB2 boot menu your default menu selection .

What tasks must be completed to accomplish this? (Choose two)
A . Run the grub2-mkconfig command
B . Edit the /etc/default/grub file and set GRUB_DEFAULX to 2
C . Run the mkinitrd command
D . Edit /etc/grub2/custom.cfg and set GRUB_MENU to3
E . Edit the /boot/grub2/menu.cfg file and set MENU_DEFAULT to 3
F . Run the systemctl reload systemd command

Answer: A,D