Which of the following statements are correct in relation to post-purchase dissonance?

A、A consumer feeling they have purchased too much after a shopping trip is an example of post-purchase dissonance.
B、A consumer feeling they have purchased what they expected after a shopping trip is an example of post-purchase dissonance.
C、A consumer having second thoughts about the wisdom of a product purchase is an example of post-purchase dissonance.
D、A salesperson who follows up with a customer after they have made a purchase may be able to reduce that customer's post-purchase dissonance.