Which constitution adopted both Urdu & Bengali as national languages?

Which constitution adopted both Urdu & Bengali as national languages?

کس آئین نے اردو اور بنگالی دونوں کو قومی زبانوں کے طور پر اپنایا؟
Explanation

              Both Urdu and Bengali were declared as official and national languages of Pakistan in the 1956 constitution

              Urdu and Bengali Was The Official Language Declared In the 1962 Constitution