Which IPv$6$ address represents the most compressed form of the IPv$6$ address $2001$:$0$db$8$:cafe:$0000$:$0835$:$0000$:$0000$:$0$aa$0?$

$2001$:db$8$:cafe:$0$:$835$::aa$0$

$2001$:db$8$:cafe::$835$::aa

$21$:db$8$:cafe:$0$:$0835$:$0$:$0$:aa$0$

$21$:db$8$:cafe::$835$::aa