A. NO the right command is:# grub2-install /dev/sda
B. NO it's for create bootable device
C. NO does not exist
D. NO does not exist
E. YES it's the right command also on Grub2 system
It's good to remember that unlike GRUB Legacy, you don't need to install GRUB2. all you do is rebuild the main installation file. This is done by running either grub-mkconfig or grub2-mkconfig.
To install GRUB2, the correct command is grub-install /dev/sdc. The command grub2 install /dev/sdc is not the correct syntax. The grub-install command is used to install the GRUB bootloader to the Master Boot Record (MBR) of the specified device, in this case, /dev/sdc. (says GPT)
It should be option A, but they missed the dash (-) in between grub2-install
grub-install will work only for grub, not for grub2
https://unix.stackexchange.com/questions/183053/grub-install-command-not-found
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