The following CREATE TABLE statement should create a table called 'employee' that consists of the employee$\_$id as the primary key that is auto$-$incremented, the first$\_$name, and the last$\_$name.

CREATE TABLE employee

employee$\_$id serial PRIMARY KEY,

first$\_$name VARCHAR $(50),$

last$\_$name VARCHAR $(50)$

$)$;

Identify the line of code that would either generate a syntax, logical$,$ or requirements error in this CREATE TABLE statement.

a$.)$

$1$

b$.)$

$3$

c$.)$

$4$

d$.)$

$2$