Answer:
Stateless DHCPv6
Step-by-step explanation:
We have three address assignment method possible:
Sateless Auto Address Configuration (SLAAC)
Stateless DHCPv6
Stateful DHCPv6
Stateful - Needs DHCPv6 server to get IP, DNS, etc.
Stateless - DHCPv6 server is not needed. In this mode, host get configuration (IP, DNS, etc.) from router address.
SLAAC is the simplest way to give an IPv6 address to a client, because it exclusively rely on Neighbor Discovery Protocol.
A Stateful address assignment involves someone keeping track of the State.
A Stateless address assignment does not keep track of what has or hasn't been assigned. In a Stateless assignment scenario, there is no server or device which keeps a running log of what IP addresses have been assigned and what IP addresses are remaining, available to be assigned.