The following CREATE TABLE statement should create a table called 'users' that consists of the user$\_$id as the primary key that is auto$-$incremented, the username, and the password.

CREATE TABLE users$($

user$\_$id int PRIMARY KEY,

username VARCHAR $(50),$

password VARCHAR $(50)$

$)$;

Identify the incorrect line of code in this CREATE TABLE statement.

a$.)$

$3$

b$.)$

$2$

c$.)$

$4$

d$.)$

$1$