Which collaboration tool is available from the banner, using the bubble icon?

'Now Messenger' is not a standard ServiceNow collaboration tool name associated with the banner bubble icon.

Agent Chat is a feature used for customer service agents to interact with end-users, not typically accessed via a generic bubble icon in the banner for general user collaboration.

Connect Chat is the real-time messaging and collaboration tool accessible directly from the ServiceNow banner via a speech bubble icon, allowing users to initiate and manage conversations.

'Collaborate Now' is not a standard ServiceNow collaboration tool name.

Live Feed is a social collaboration tool that displays activity streams, but it is not the primary tool accessed via the banner's bubble icon for direct chat.