What are the two ways you can buy an App Installs campaign on Twitter?(select two)

Twitter offers two primary ways to buy App Installs campaigns. Cost per App Click (CPAC) is a bidding strategy where you pay each time a user clicks on your app install ad. This focuses on driving initial engagement with your ad. Optimized Action Bidding (OAB) is a more advanced bidding strategy where you bid on a desired action, such as an app install, and Twitter's system optimizes delivery to achieve the most installs at the best possible cost. This shifts the focus from clicks to actual conversions. Cost per Download (CPD) is not a standard buying option for app install campaigns on Twitter; while downloads are the ultimate goal, the bidding mechanisms are CPAC or OAB.