Which of the following statements are correct?
选项：

A:The stage that a product is at in the product life cycle depends solely on how long the product has been in the market.
B:In the maturity phase of the product life cycle, sales will most likely peak or start to fall.
C:he new product development phase of the product life cycle can involve substantial costs for an organisation.
D:Products may be unprofitable in the introduction phase of the product life cycle.