To manage comments and replies for all of your YouTube channel’s videos (in Hootsuite), simply add a ________________ stream.

The correct answer is "published comments." In Hootsuite, to effectively manage all comments and replies across your YouTube channel's videos, you need to add a "published comments" stream. This specific stream type is designed to pull in all public comments made on your YouTube content, allowing you to monitor and respond directly from your Hootsuite dashboard. "Search" streams are used for tracking keywords or phrases, not for managing comments on your own content. "Replies" is too general and doesn't specify the source or functionality within Hootsuite for YouTube. "YouTube engagement" is a broad term that encompasses many metrics but isn't a specific stream type for comment management. "Moderate" is a function or action, not a type of stream you add.