The product life cycle refers to __________.
a. the average life span of a product mix
b. a concept that describes the stages a new product goes through from product concept to commercialization
c. a concept that describes the stages a product goes through in the marketplace—early growth, accelerated development, maturity, and harvesting
d. a concept that describes the stages a product goes through in the marketplace—introduction, growth, maturity, and decline
e. the amount of time it takes a product innovation to completely diffuse in the marketplace