Explanation

Austria is correct because its Foreign Minister addressed the 73rd session of UNO in both Arabic and English. Palestine is incorrect because there is no specific information provided to confirm this dual language address for Palestine. Saudi Arabia is incorrect because the question specifies a country whose minister gave such an address, and Austria is cited as the correct one. Iraq is incorrect because it is not stated that its Foreign Minister addressed the 73rd session of UNO in both Arabic and English.