Which of the following statements are correct?
A、For many products, as competition increases over time, features that could once have been classified as augmented become expected or even core features.
B、The core product comprises the fundamental product benefit that satisfies the consumer's need or want.
C、For some products, support services and guarantees may be at the augmented product level, and for other products, these same features may be at the expected level.
D、A product can be a consumer product or a business-to-business product, but not both.