An IGMP version 3 receiver signals EXCLUDE mode with an empty EXCLUDE list. What does this indicate?

An IGMP version 3 receiver signals EXCLUDE mode with an empty EXCLUDE list. What does this indicate?
A .  This is the initial join message and exclusions of sources will follow
B .  It is willing to receive traffic from any source
C .  This is the initial join message and a selection of source will follow
D .  This is the way it indicates it is leaving the group

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Answer: B