Your network contains a single Active Directory domain. The domain contains a computer that runs Windows
10.
You plan to use the computer to test applications.
You need to install Windows Insider Preview builds on the computer.
What should you do?

A.
From Group Policy, configure the Add features to Windows 10 settings.

B.
From the Settings app, configure the Advanced options for Windows Update.

C.
From Group Policy, configure the Windows Update settings.

D.
From the Settings app, select Developer mode.

Explanation:
http://www.howtogeek.com/224826/how-to-become-a-windows-insider-and-test-new-windows-10-features/