Documents stored in the cloudarealso stored as a downloaded copy in each device $($computer$,$ tablet, phone$).$ If devices arenotified of any changes made in the cloud copy, the copies on the devices must be refreshed$/$updated $.$At the same time, when there are changes in the copies on the devices, they must be loaded into the cloud insuch a way that they do not override each others. At thesame time changes will becontrolled by suffix addautomaticaly. New file will be upload to cloud with new suffix. Which design pattern could be applied?Draw uml class diagram.