Concerning IP address shortages, what is the most important difference between IPv$4$ and IPv$6?$

It will be less expensive for a company to have multiple IPv$6$ addresses as compared to IPv$4$ addresses.

IPv$6$ addresses are simpler and therefore easier to remember than IPv$4$ addresses.

IPv$6$ addresses are more secure$.$

There are many, many more potential IPv$6$ addresses than IPv$4$ addresses.