Given this new table, which INSERT statement would query from the customer table to insert the email address of all customers that live in the country USA?

a$.)$

INSERT INTO mailinglist $($email$)$

SELECT email FROM customer

WHERE country $=$ 'USA';

b$.)$

INSERT INTO mailinglist

SELECT email FROM customer

WHERE country $=$ 'USA';

c$.)$

INSERT INTO mailinglist $($user$\_$id$,$ email$)$

SELECT email FROM customer

WHERE country $=$ USA;

d$.)$

INSERT INTO mailinglist $($email$)$

SELECT email FROM customer;