What are the key characteristics of the IPv$6$ protocol?

What are the key characteristics of the IPv$6$ protocol?

what is the answer here?

$1.$ IPv$6$ addresses are $64$ bits long and are represented in hexadecimal notation.

$2.$ IPv$6$ addresses are $128$ bits long and are represented in hexadecimal notation.

$3.$ IPv$6$ addresses are $32$ bits long and are represented in dotted decimal notation.

$4.$ IPv$6$ addresses are $256$ bits long and are represented in binary notation.