Iran is prepared for "all scenarios" in talks with world powers about curbing its nuclear program in exchange for sanctions relief, its top nuclear negotiator said on Friday when asked what would happen if no final deal was reached by July.Diplomats have been pushing to iron out details of a final agreement in Vienna this week without announcing any major breakthrough as a self-imposed deadline for a deal at the end of June is drawing nearer."Even if I'm optimistic, that doesn't mean that any deal is acceptable. All parties want a good deal and for Iran it's only a good deal if our legitimate rights are respected and sanctioned are finished," top negotiator and deputy foreign minister Abbas Araqchi told the Austrian news agency APA."We have thought of all possibilities and, accordingly, are prepared for all scenarios," he said.Iran, which denies seeking nuclear weapons, has said sanctions must be rescinded as soon as any final deal is signed. The United States wants a gradual lifting of restrictions tied to verified compliance by Iran with its end of the deal - a big sticking point left unresolved so far.