Using Identification IDs and Passwords on a Website for Customers

Using identification IDs and passwords on a website for customers allow for each of the following benefits, except:

A) the customer can be greeted personally, by name
B) provides data for a customer cluster analysis
C) the content of the Web pages can be customized to fit the customer's past browsing behavior
D) when an order is placed, the customer doesn't have to type in his/her address and credit card information