Due to the use of cookies, many websites are able to track visitors when they return to their websites. This helps them track how often the visitor views the website and in what products he or she shows an interest. Some websites have capitalized on this by providing product recommendations to users when they return to their websites based on their past activity. This is an example of

a$.$ interactivity.

b$.$ control.

c$.$ accessibility.

d$.$ addressability,

e$.$ connectivity.