You need to configure the virtual machines that have the Pool1 prefix. The solution must meet the technical requirements.
What should you use?

Note: This question is part of a series of questions that present the same scenario. Each question in the series contains a unique solution that might meet the stated goals. Some question sets might have more than one correct solution, while others might not have a correct solution.
After you answer a question in this section, you will NOT be able to return to it. As a result, these questions will not appear in the review screen.
You have an Azure Virtual Desktop host pool that runs Windows 10 Enterprise multi-session.
User sessions are load-balanced between the session hosts. Idle session timeout is 30 minutes.
You plan to shut down a session host named Host1 to perform routine maintenance.
You need to prevent new user sessions to Host1 without disconnecting active user sessions.
Solution: From the host pool, you change the Drain mode of Host1.
Does this meet the goal?

You have an Azure subscription that contains 500 users. The users are assigned Microsoft Office 365 E1 licenses.
You deploy an Azure Virtual Desktop solution that contains Windows 10 multi-session hosts and streams a custom remote app named App1.
You need to ensure that the users are licensed to stream App1. The solution must minimize costs.
Which license should you use?