A company has an Office 365 tenant. You plan to distribute the Office 365 ProPlus client to users.
The client machines do not normally have Internet access.
You need to activate the Office 365 ProPlus installations and ensure that the licenses remain active.
What should you do?

A.
Connect the client computer to the Internet once to activate the Office 365 ProPlus client, and once every 90 days after that.

B.
Connect the client computer to the Internet once to activate the Office 365 ProPlus client, and once every 30 days after that.

C.
Connect the client computer to the Internet only once to activate the Office 365 ProPlus client

D.
Connect the client computer to the Internet once to activate the Office 365 ProPlus client, and once every 180 days after that.

E.
Connect the client computer to the Internet once to activate the Office 365 ProPlus client, and once every 365 days after that.

Explanation:
After you’ve verified the user is assigned a license, you should check that Office 365 ProPlus is activated. Activation usually occurs during initial installation. The
computer has to connect to the Internet at least once every 30 days for Office 365 ProPlus to remain activated.
Troubleshooting tips for Office 365 ProPlus
https://technet.microsoft.com/en-us/library/gg702620.aspx