About Honest Person, the question that maybe too heavy for your brain

THE HONEST PERSON

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There are three man on the room..
Two are liar, the other one is honest person

They are Alex, Bradd and Curtis..
Each of them make one statement to verify the truth:

Alex: Bradd and Curtis are a liar

Bradd: Alex is an honest person

Curtis: Alex is a liar


Who is the honest person....?