Logic question: which is right?

If someone says I'm gonna give you 3 of these 4 people to be on your team:

Mark
JohnAlexBlakeAnd you really one Mark on your team. Would you say "I insist Mark is one of the three"Or "I insist Mark is one of the four"
I insist Mark is one of the three
Vote A
I insist Mark is one of the four
Vote B
Select age and gender to cast your vote:
GirlGuy
Logic question: which is right?
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