Which Windows PowerShell cmdlet should you run?

You have an Office 365 tenant that uses an Enterprise E1 subscription.
You need to convert the users in the tenant to an Enterprise E3 subscription.
Which Windows PowerShell cmdlet should you run?

A.
Set-MsolUser

B.
Redo-MsolProvisionUser

C.
Set-MsolUserLicense

D.
Set-MsolUserPrincipalName

E.
Convert-MsolFederatedUser

F.
Set-MailUser

G.
Set-LinkedUser

H.
New-MsolUser

Explanation:
The Set-MsolUserLicense cmdlet can be used to adjust the licenses for a user. This can include
adding a new license, removing a license, updating the license options, or any combination of these
actions.
Note: Switching plans manually means that you’re completing the following separate procedures
instead of using the switch plans wizard. The procedures are:
Buy licenses for the subscription you’re switching users to.
Verify the subscription is ready to switch users to.
Reassign user licenses
Remove unneeded licenses from the subscription you’re switching from.
Cancel the original subscription (if switching all users).
Switching only some users isn’t supported by the switch

Set-MsolUserLicense
https://msdn.microsoft.com/en-us/library/azure/dn194094.aspx