Contoso Investments are bidding for individual display impressions in a real time auction. This is an example of which sales model?

The programmatic sales model involves automated, real-time bidding for individual ad impressions, which perfectly describes Contoso Investments' scenario. This model uses technology to buy and sell ad inventory, often through real-time bidding (RTB) exchanges. The search advertising sales model is incorrect because it pertains to ads displayed on search engine results pages, not display impressions. The cost per thousand impressions (CPM) sales model is a pricing model, not a sales model describing the method of transaction. While programmatic advertising can be priced on a CPM basis, CPM itself doesn't define the automated bidding process. The guaranteed sales model involves pre-negotiated, fixed-price deals for a set number of impressions, which contrasts with real-time bidding for individual impressions.