IPV6 stateless autoconfiguration - NDP - Stateless DHCP

[cami]

Good morning at all,
anybody can help me to understand, in ICND2 book Official Exam Certification Guide
Second Edition
of Wendell Odom, ipv6 chapter 17 question 5, about stateless autoconfiguration:

question 5
Which of the following help allow an IPv6 host to learn the IP address of a default
gateway on its subnet?
a. Stateful DHCP
b. Stateless RS
c. Stateless autoconfiguration
d. Neighbor Discovery Protocol

I answered A and C, but the book write A and D: why the C is not valid ?
A host that uses stateless autoconfiguration can learn its IPv6 address and prefix automatically, as
well as learn its default router IP address, in both cases using NDP RS/RA messages (page 599).

For the same reason the question n. 4:
Which of the following answers list either a protocol or function that can be used by a
host to dynamically learn its own IPv6 address?
a. Stateful DHCP
b. Stateless DHCP
c. Stateless autoconfiguration
d. Neighbor Discovery Protocol

the answer A and C would not correct, it would be: A and D, where the NDP is always used.

Thank you in advance.

[carini]

Good morning at all,

question 5
Which of the following help allow an IPv6 host to learn the IP address of a default
gateway on its subnet?

Thank you in advance.

I think that the key is in the word "learn" which implies that you have to learn from somewhere