Which SELECT clause calculates the total percentage of inventory for each product? inventory Product Quantity Shirt 5 Shoes 3 Pants 2 Results Product Pct Shirt 50% Shoes 30% Pants 20% a. select Product, Quantity, sum(Quantity) as Total format=percent5.2 from inventory; b. select Product, (select sum(Quantity) from inventory) as Pct format=percent5.2 from inventory; c. select Product, Quantity/(select sum(Quantity)) as Pct format=percent5.2 from inventory; d. select Product, Quantity/sum(Quantity) as Pct format=percent5.2 from inventory