6.An example of a fixed cost is when .A. an office supply store charges $3.99 for a ream of paper as its everyday low priceB. a company pays all the secretaries the same base salary and gives them the same cost-of-living increaseC. acompany pays the same amount of rent every month for the use of a manufacturing plantD. a company does not raise the price of its service contract on photocopy machines for 10 years