After almost going bankrupt during the invasion of Japanese motorcycle manufacturers (Honda, Yamaha, Kawasaki) into the U.S. market, Harley-Davidson has re-emerged as a highly successful, and profitable, motorcycle manufacturer. What have been the keys to Harley's success?

a	Selling an experience rather than a product
b	Making a quieter motorcycle to match competitors
c	Selling larger, more muscular motorcycles
d	Improving technology through innovation