which of the following contributes to your active digital footprint?

a. adware that secretly tracks your buying behavior online
b. personal information you intentionally enter into a secure website when making a purchase
c. personal date from public records such as home sales
d. information about you from online newspaper articles

All of the above options contribute to your active digital footprint.

The following options contribute to your active digital footprint:

b. Personal information you intentionally enter into a secure website when making a purchase.
d. Information about you from online newspaper articles.

Both entering personal information on secure websites and being mentioned in online newspaper articles leave a digital trace that contributes to your active digital footprint.