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Which of the following queries will use a subquery to find the rows in the invoice table that have been invoiced after 2 0 1

Which of the following queries will use a subquery to find the rows in the invoice table that have been invoiced after 2013-01-01 and that have an invoice total larger than the maximum total of invoices of those in the country Belgium?
a.)
SELECT * FROM invoice
WHERE total >
(SELECT MAX(total) FROM invoice
WHERE billing_country = 'Belgium')
AND invoice_date >'2013-01-01';
b.)
SELECT * FROM invoice
WHERE total >
(SELECT MAX(total) FROM invoice
WHERE invoice_date >'2013-01-01')
AND billing_country = 'Belgium';
c.)
SELECT * FROM invoice
WHERE total >
SELECT MAX(total) FROM invoice
WHERE billing_country = 'Belgium'
AND invoice_date >'2013-01-01';
d.)
SELECT * FROM invoice
WHERE total >
(SELECT MIN(total) FROM invoice
WHERE billing_country = 'Belgium')
AND invoice_date >'2013-01-01';

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