I would have said 平和 (heiwa). As another learner, I've never seen 安泰, and ピース I see mostly used as a reference to the "peace sign" (the hand gesture).
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I would have said 平和 (heiwa). As another learner, I've never seen 安泰, and ピース I see mostly used as a reference to the "peace sign" (the hand gesture).