How does IS unify anonymous identifies?

A brand’s website is seeing high traffic but much of the behaviour is anonymous.

How does IS unify anonymous identifies?
A . IS uses probability matching to determine if two or more profiles represent for user identity
B. IS synchronise anonymous and knows profiles once a day based or online traffic and data offer sources
C. IS constantly monitors identifying information then user determines matching to determine if two or more profiles identify
D. IS users third party software to match anonymous and knows identifies

Answer: D