Tammy Waffles used $3,500 of materials, $2,000 direct labor, $500 overhead for the sales of waffles for the month of July. On top of that, there is also $1,000 advertising expense that Tammy paid. How much is part of the cost of goods sold and the operating expenses, respectively? O $6,000 cost of goods sold; $1,000 operating expense O $7,000 operating expense O $6,000 operating expense; $1,000 cost of goods sold O $7,000 cost of goods sold