Dynamic remarketing lets an advertiser:

August 12, 2019 Certificate Land

show prior visitors to his site ads that are based on products or services they saw on the site
show an ad to someone on his mobile device 24 hours after visiting the website on a desktop PC
re–run an ad to increase the volume of people who will see it
engage visitors to the website by opening a chat session

The correct answer is:

show prior visitors to his site ads that are based on products or services they saw on the site.