Using the groupadd -p command overrides the settings found in the file a. /etc/
The groupadd -p command is used to add a new group to the system with a specified password. The password information is usually stored in the /etc/gshadow file, not in any of the directories mentioned in the options.
The groupadd -p command, when used to set the password for a group, overrides the settings found in the /etc/gshadow file. The /etc/gshadow file is used to store secure group account information, including the encrypted group passwords.
So, the correct answer would be: a. /etc/