What targeting rules display an ad to users who have viewed a product, but not purchased it? - The Future Of Ink

Home Campaign Manager Certification Assessment What targeting rules display an ad to users who have viewed a product, but not purchased it?

Positively target all product viewers AND negatively target all product purchasers
Positively target all product viewers AND collect purchase IDs using u-variables
Positively target all product purchasers AND negatively target all product viewers
Negatively target all product purchasers AND collect purchase IDs using u-variables