Which one of the following sets of phyla have animals showing presence of circulatory system? 

1
Annelida, Arthropoda, Echinodermata, Mollusca 
2
Arthropoda, Platyhelminthes, Mollusca, Annelida  
3
Platyhelminthes, Echinodermata, Hemichordates, Annelida
4
Chordata, Aschelminthes, Mollusca, Arthropoda 

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