
Explanation:
Box 1: Device1 and Device3 only
Requirements for deploying the information protection client
To use the Microsoft Purview Information Protection client, install this client on Windows computers where you want to use the client components.
Box 2: File Explorer
The Microsoft Purview Information Protection client can be installed and used with File Explorer in Windows. You can apply sensitivity labels and protection to files directly within File Explorer.
Reference:
https://learn.microsoft.com/en-us/purview/information-protection-client