Which of the following is an example of an IP$-$based communication is$?$Select one:A$.$Plain old telephone service $($POTS$)$B$.$Circuit$-$Switched Data $($CSD$)$ and High$-$Speed Circuit$-$Switched Data $($HSCSD$)$ cellular networksC.Integrated Services Digital Network $($ISDN$)$ B$-$channelD.Voice over Internet Protocol $($VoIP$)$