Which of the following means 'expressing a wish'?
well in the Italian language one of the use of subjunctive is for 'expressing a wish' especially if used after certain tipe of verbs, such as hope, desire... and used it with the second person.
The optative is a subsection of the subjunctive for wishes.
I think you're right, Willbut. "Optative" it is. ;-)
Well, sufficient unto the day the learning therein!