Digital marketers seeking to interact with EU consumers on their websites must do all but which of the following to comply with privacy regulations in those markets?

a$.$

Delete collected data for visitors that have not returned to the site within the last $6$ months.

b$.$

Gain express consent from visitors before collecting their data.

c$.$

Provide the purpose for requesting specific types of visitor data on specific forms.

d$.$

Digital marketers must do all of these things if they want to comply with EU privacy regulations.