Which one of the following is NOT an attractive way to reduce costs and help a company achieve a competitive advantage based on lower overall costs per pair sold than rival companies? ONot offering free shipping to online buyers OSpending a maximum of $1 million annually per region on search engine advertising O Avoiding bidding for endorsement contracts with celebrities-celebrity endorsement contracts always raise costs per branded pair sold (however, stiff competition from rivals may require having at least one celebrity endorsement) O Delivering orders to footwear retailers in 4 weeks and not offering mail-in rebates Investing in production improvement option A that reduces reject rates by 50%