Which three queres use valid ex press io ns?

A、SELECT produet_idz unit_pricer, 5 "Discount'^unicprice+surcharge-discount FROM products;
B、SELECT product」d, {unit_price • 0.15 / (4.75 + 552.25)) FROM products;
C、SELECT ptoduct_idz (expiry_date ・ delivery_date) * 2 FROM products；
D、SPLECT productjd, expiry_date * 2 FROM products;
E、SELEGT product_id? unit_price, unit_price + surcharge FROM products;
F、SELECT product_id,unit_price 11 "Discount", unit_price + surcharge - discount FROM products;