Which SQL statement will return the same results as the following SQL statement?

SELECT $*$ FROM orders, customers;

a$.$

SELECT $*$ FROM o orders $,$ c customers

WHERE o$.$customer# $=$ c$.$customer#;

b$.$

SELECT $*$ FROM orders, customers

WHERE orders.customer# $>$ customers.customer#;

c$.$

$$SELECT $*$ FROM orders CROSS JOIN customers;

d$.$

SELECT $*$ FROM orders, customers

WHERE orders.customer# $=$ customers.customer#;