GLOP addressing is defined in RFC 2770. It assigns globally unique multicast addresses based on an organization's ASN by mapping the 16-bit ASN into the middle two octets of the 233.0.0.0/8 address space.
233.0.0.0/8 is specifically reserved for GLOP addressing.
The uniqueness of the address is derived from the assigned ASN.
Why other options are incorrect:
A: 232.0.0.0/8 is SSM address space.
C: 239.0.0.0/8 is for administratively scoped multicast.
D: 224.0.0.0/24 is reserved for local multicast (link-local scope).
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