To answer this question, you need to understand the different types of IPv6 addresses.
Option A) Private - This option is incorrect because private addresses are not Internet-valid addresses. Private addresses are used within a private network and are not routable over the Internet.
Option B) Global - This option is incorrect because global addresses are not specifically used to identify Internet-valid addresses. Global addresses are used to identify individual interfaces on the IPv6 Internet.
Option C) Public - This option is correct because public addresses are used to identify Internet-valid addresses. Public addresses are globally unique and routable over the Internet.
Option D) Unique - This option is incorrect because all IPv6 addresses are unique. However, not all unique addresses are Internet-valid. Internet-valid addresses are specifically referred to as public addresses.
The correct answer is C) Public. This option is correct because public addresses are used to identify Internet-valid addresses.