Which bidding strategy is NOT eligible for Display campaigns?

Target Impression Share is a bidding strategy designed for Search campaigns to help you achieve a specific percentage of impressions at the top of the page or anywhere on the page. It is not available for Display campaigns, which focus on visual ads across a network of websites and apps. The other options listed—Target ROAS, Viewable Impressions, Max Clicks, Max Conversions, Manual (with optional eCPC), and Target CPA—are all eligible bidding strategies for Google Display campaigns, allowing advertisers to optimize for various goals like return on ad spend, visibility, clicks, conversions, or a specific cost per acquisition.