A hierarchical chain of organizations distributes IPv6 addresses. Choose the correct hierarchy, from left to right, with the one on the far left being the top organization.
IANA, LIR, RIR, NIR, EU
RIR, IANA, NIR, LIR, EU
IANA, EU, RIR, NIR, LIR
IANA, RIR, NIR, LIR, EU