Based on the following: Log in as root, and run the following commands: groupadd group1 groupadd group2 useradd user1 useradd -G group1,group2 user2 useradd -g group2 user3 useradd -G user1,user2,group1 user4 gpasswd -a user1 group2 gpasswd -d user2 group2 usermod -G group1,group2 user3 groups user4 Who are members of group1?
1) user2, user4
2) user1, user2
3) user2, user3, user4
4) user1, user3, user4
5) None of the above