What Is the Key Marketing Objective for Advertising on Social

What is the key marketing objective for advertising on social networking sites?

A) Developing cost-effective ads with a CPM of less than 50¢ for every 1,000 hits.
B) Creating ads that have an immediate impact on sales.
C) Trying to gain viewers' attention for a few extra seconds with entertaining video.
D) Using the cost per click performance metric to assess how many times a unique visitor purchases a product that originated from an ad on the firm's website.
E) Creating ads that appeal to all demographic groups-regardless of age,gender,ethnicity,education,or income-to maximize cost efficiency.