A global brand is running ads across multiple exchanges and wants to have automated control over how many times a unique user is exposed to the message. Which benefit allows for this?

Frequency management is the correct benefit because Display & Video 360 uses frequency capping to control how often ads are shown to a given user. Google states that frequency caps can be set across all inventory types, different environments such as mobile, desktop, and connected TV, and across inventory sources including specific publishers. That makes it the platform capability for automated control of repeated exposure to unique users across multiple exchanges. It is an exposure-management function, not a trafficking, reporting, or bidding-value feature. Google Help+1