Examine the description of the PRODUCTS table:Which three queries use valid expressions?

A、SELECTproduct_id,(unit_price*0.15/(4.75+552.25))FROMproducts;
B、SELECTproduct_id,(expiry_date-delivery_date)*2FROMproducts;
C、SELECTproduct_id,unit_price,unit_price+surchargeFROMproducts;
D、SELECTproduct_id,unit_price||5“Discount”,unit_price+surcharge-discountFROMproducts;
E、SELECTproduct_id,unit_price,5“Discount”,unit_price+surcharge-discountFROMproducts;
F、SELECTproduct_id,expiry_date*2FROMproducts;