Which of the following options correctly represents the selling and buying process in a programmatic environment?

The correct option accurately describes the programmatic advertising flow. Advertisers use a Demand-Side Platform (DSP) to manage their campaigns, setting bids and targeting parameters. When a user visits a website, the publisher's Supply-Side Platform (SSP) or ad exchange initiates a real-time auction by sending bid requests to various DSPs. DSPs then evaluate these requests based on the advertiser's criteria and submit bids. The SSP/exchange awards the impression to the highest bidder, and the winning ad is displayed to the user. The first incorrect option reverses the roles of advertisers and publishers, stating advertisers report willingness to pay through an SSP/Exchange, which is incorrect as SSPs are for publishers. The third incorrect option suggests direct communication between advertisers and publishers through an SSP/Exchange for buying, and then a DSP auctions spaces regardless of users, which misrepresents the roles and real-time nature. The fourth incorrect option describes advertisers receiving alerts for each user visit and purchasing through a DSP, which is not how real-time bidding operates; the process is automated and instantaneous.