When a Shopper Visits Sunglasses

When a shopper visits Sunglasses.com and clicks on a pair of sunglasses, a "see similar styles" option is shown. This option uses image recognition and artificial intelligence technology to show other sunglasses that might be suitable choices for the shopper. This practice is a form of

A) permission marketing.
B) personalization.
C) transactional website.
D) collaborative filtering.
E) customerization.