Which of the following services provides support to publishers in managing their ad inventory?

The Sell Side Platform (SSP) is designed to assist publishers in managing their ad inventory effectively. SSPs enable publishers to maximize their advertising revenues by providing tools for inventory management, pricing optimization, and demand aggregation from various sources. This offers publishers the ability to connect with multiple demand sources, such as advertisers and ad exchanges, in real-time, thus facilitating efficient ad sales processes.

By leveraging an SSP, publishers can automate their ad selling processes, set up their inventory according to user preferences and audience data, and optimize their pricing strategies based on market demand. SSPs also help in auctioning ad space typically in real-time, which is crucial for maximizing revenues from digital advertising.

In contrast, while Demand Side Platforms (DSPs) serve advertisers in purchasing ad space across various inventory, Content Management Systems (CMS) are primarily focused on managing website content rather than ad inventory. Social Media Platforms (SMPs) are typically platforms for social engagement and advertising but do not specialize in managing ad inventories for publishers.