Refer to the exhibit. An IPv6 address must be obtained automatically on the LAN interface on R1. Which command must be implemented to accomplish the task?

`ipv6 address autocontig` is not a valid command for configuring automatic IPv6 address assignment on a Cisco router.

The `ipv6 address dhcp` command configures an interface to act as a DHCPv6 client, allowing it to dynamically obtain an IPv6 address, prefix, and other configuration parameters from a DHCPv6 server. This is the standard method for automatic IPv6 address acquisition specified in the question.

`ipv6 address fe80::/10` would configure a link-local address range, which is automatically assigned but does not provide a global unicast address for internetwork communication.

`ipv6 address 2001:db8:d8d2:1008:4332:45:0570::/64` is a command for manually configuring a static global unicast IPv6 address, not for automatic acquisition.