An e$-$commerce site uses collaborative filtering to recommend products and dynamically adjust prices. If the system starts using user$-$based filtering to personalize price offers based on user activity and history, what ethical concern could this raise?

Group of answer choices

It may lead to price discrimination where different users are charged differently for the same product.

The system might inadvertently favor newer users over returning ones.

Users might feel overwhelmed by the frequency of price changes.

It could reduce sales as users wait for prices to drop before purchasing.