You need to ensure that users can dial telephone number…

You administer an Office 365 deployment.
You need to ensure that users can dial telephone numbers by using either the Skype for Business app for
Windows or the Skype for Business mobile app.
What should you do?

A.
In the Office 365 Admin center, enable Skype for Business PSTN Calling.

B.
Run the Windows PowerShell cmdletEnable-CsOnlineDialInConferencingUser.

C.
In the Office 365 Admin center, enable Skype Meeting Broadcast.

D.
Run the Windows PowerShell cmdletSet-CsUser.