a) Note signed in the upper left hand corner – This is negotiable because there is a promise in the form of written communication actualized/realized by signing the document of the promissory note. The written promise is about ensuring that there would be a stated sum paid to a specified person. The written promise could also be about ensuring that there would be a stated sum paid to the bearer of the note whenever the bearer would demand or at a date as specified in the promissory note.