What should you first?

Your network contains an on-premises Active Directory domain named contoso.com. The domain contains 1,000 Windows 10 devices.
You perform a proof of concept (PoC) deployment of Windows Defender Advanced Threat Protection (ATP) for 10 test devices. During the onboarding process, you configure Windows Defender ATP-related data to be stored in the United
States.
You plan to onboard all the devices to Windows Defender ATP.
You need to store the Windows Defender ATP data in Europe.
What should you first?
A. Create a workspace.
B. Onboard a new device.
C. Delete the workspace.
D. Offboard the test devices.