Router R1 currently has no configuration related to IPv6 or IPv4. The following configuration
exists in a planning document intended to be used to copy/paste into
Router R1 to enable EIGRP for IPv6 on interfaces F0/0 and S0/0/0. No other related
configuration exists. Assuming F0/0 and S0/0/0 reach an up/up state, which of the following
is true about EIGRP for IPv6 on R1 after this configuration has been pasted into R1?
ipv6 router eigrp 1
ipv6 unicast-routing
interface f0/0

ipv6 address 2000::1/64
ipv6 eigrp 1
interface s0/0/0
ipv6 address 2001::/64 eui-64
ipv6 eigrp 1

A.
EIGRP works on F0/0 and S0/0/0 without further configuration.

B.
EIGRP works with the addition of one command: a no shutdown command in EIGRP
router configuration modE.

C.
EIGRP works with the addition of one command: an eigrp router-id command in EIGRP
router configuration modE.

D.
EIGRP for IPv6 needs at least two more configuration commands before it works on R1.

Explanation:
Because the question states that no IPv4 configuration exists, EIGRP for IPv6 cannot derive
a 32-bit EIGRP router ID. Before EIGRP will work, R1 needs to define an EIGRP router ID
(using the eigrp router-id command) and enable EIGRP using the no shutdown router
subcommand.