How does an IPv6 host automatically generate a global address?

How does an IPv6 host automatically generate a global address?
A . It prepends its interface identifier to the network prefixes contained in Router Solicitation messages.
B . It appends its interface identifier to the network prefixes contained in Router Advertisement messages.
C . It appends its interface identifier to the network prefixes contained in Router Solicitation messages.
D . It prepends its interface identifier to the network prefixes contained in Router Advertisement messages

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Answer: B