Which of the following IPv$6$ features is NOT an enhancement to IPv$4?$

Group of answer choices

IPv$6$ also contains built$-$in support for Internet Protocol Security $($IPSec$),$ whereas IPv$4$s support for IPSec is an add$-$on feature.

IPv$6$ addresses are assigned to each continent$/$country with an appropriate contiguous block of addresses to faciliate global routing more efficiently.

IPv$6$ provides built$-$in security, so it is more secure than IPv$4.$

IPv$6$ includes a built$-$in function to support Quality of Service $($QoS$)$ for prioritising data based on the type of urgency of information.