You want to setup a separate network at home that is accessible from the internet. You want it to be isolated from your personal network, so you lease an IPV$6$ address from the ISP. When you configure the interface IDS of the devices on the network, which bits in the IPV$6$ address will you be modifying?

The first $48$ bits of the IPV$6$ address

The $16$ bits following the first $48$

The last $64$ bits of the IPV$6$ address

The last $32$ bits of the IPV $6$ address