What Can the Marketers of Consumer Products Expect to Find

What can the marketers of consumer products expect to find when they study and apply the product life cycle theory to their products?

A) All products go through every stage of the life cycle.
B) Changes in a product can change its life cycle.
C) The amount of time products stay in each stage is standardized for consumer products,but not industrial products.
D) All products except those considered faddish go through every stage.
E) The theory helps to predict how long a firm will stay in each stage.