CORRECT TEXT
Add users: user2, user3.
The Additional group of the two users: user2, user3 is the admin group Password: redhat

A.
# useradd -G admin user3

B.
# useradd -G admin user2

C.
# passwd user3

D.
# useradd -G admin user3

Explanation:
# useradd -G admin user2
# useradd -G admin user3
# passwd user2
redhat
# passwd user3
redhat