$9$ Why is NAT not needed in IPv$6?$

The problems that are induced by NAT applications are solved because the IPv$6$ header improves packet handling by intermediate routers.

Because IPv$6$ has integrated security, there is no need to hide the IPv$6$ addresses of internal networks.

The end$-$to$-$end connectivity problems that are caused by NAT are solved because the number of routes increases with the number of nodes that are connected to the Internet.

Any host or user can get a public IRv$6$ network address because the number of available IPv$6$ addresses is extremely large.