You work as a Systems Administrator for your company. The company has a subscription to Microsoft 365. All users in your company have a Microsoft 365 E3 license. Most users currently use Microsoft Teams for collaboration. However, several users still use Microsoft Skype for Business Online for collaboration. You plan to migrate all users to Microsoft Teams. You need to configure the environment to ensure that Microsoft Teams is downloaded and installed in the background for all Microsoft Skype for Business users. Which of the following actions should you perform? 

Answer options:

A. Configure the Teams upgrade settings in the Microsoft Teams admin center.
B. Configure the External access settings in the Microsoft Teams admin center.
C. Configure an App Setup policy in the Microsoft Teams admin center.
D. Configure an App Permission policy in the Microsoft Teams admin center.

A