Explanation
Graphical user interface, application Description automatically generated

Box 1: Use the demo website
When publishing the bot to the web, you can publish to a prebuilt demo website (which you can use to share the bot with your teammates and stakeholders) and to your own live website.
Box 2: Share the chatbot to a security group containing all users.
A license for each user, also known as a "per user license" (or "Power Virtual Agent User License" as referred to on the Microsoft 365 admin center), should be assigned to individual users who need access to create and manage chatbots.
To simplify user license management, you can assign licenses to an Azure Active Directory (Azure AD) security group.
Box 3: Embed the chatbot code in an IFRame on your copany's public website You can add your bot to a live website as an IFrame. Your live website can be a customer-facing external website or an internal site, like a SharePoint or Yammer site.
Reference:
https://docs.microsoft.com/en-us/power-virtual-agents/publication-connect-bot-to-web-channels
https://docs.microsoft.com/en-us/power-virtual-agents/requirements-licensing