Which statements will be able to show the following result set?

a$.)$

SELECT invoice$\_$id$,$ total, last$\_$name

FROM invoice

JOIN customer

USING $($invoice$.$customer$\_$id $=$ customer.customer$\_$id$)$;

b$.)$

SELECT invoice$\_$id$,$ total, last$\_$name

FROM invoice, customer;

c$.)$

SELECT invoice$\_$id$,$ total, last$\_$name

FROM invoice

JOIN customer

USING $($customer$\_$id$)$;

d$.)$

SELECT invoice$\_$id$,$ total, last$\_$name

FROM invoice

WHERE customer$\_$id $!=$ NULL;

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