Netflix streams more movie and program content by far than any other video service. Worldwide, Netflix's $209$ million paid subscribers watch more than $6$ billion hours of movies, TV programs, and original Netflix content each month. But while avid Netflixers are busy watching Netflix, Netflix is also busy watching them$$very$,$ very closely. Every day, Netflix tracks and parses member data on tens of millions of searches, ratings, and "plays." This is an example of $\_\_\_\_\_\_\_\_.$

sample size

marketing analytics

customer relationship management $($CRM$)$

online marketing survey research

behavioral marketing