You administer a Skype for Business Server 2015 environment. You delegate the CsServerAdministrator role to User1. User1 must manage the installation and deployment of device updates. User1 fails to import a device update package on the server due to insufficient permissions. You need to ensure that User1 has the minimum permissions required to install and manage updates for devices. What should you do?
A. Assign User1 the CsLocationAdministratorrole. B. Grant User1 membership to the RTCUniversalUserAdmins group. C. Grant User1 membership to the RTCUniversalServerAdmins group. D. Assign User1 the CsVoiceAdministrator role.