What happens when Mist subscriptions expire?

What happens when Mist subscriptions expire?

A. Devices retain their configurations but the Mist user is prevented from accessing the Mist management GUI. B. Devices retain their configurations and all Mist management GUI functionality remains available to the user. C. Devices retain their configurations but Mist management GUI functionality related to expired subscriptions are not configurable by the user. D. Devices retain their configurations for 90 days; if the subscriptions are not renewed, the configuration is deleted and the devices are reset to factory default.