The Earth is flat. The Earth is round. Plato is a lousy philosopher. Justification varies from person to person. Notice furthermore that the individual statements never change the columns.
Truth is objective.
The conclusion is supposed to follow from the premises . It is usually indicated by a connective 'therefore', 'thus', 'hence', etc. The premises and conclusions of arguments can be true or false, justified or not, but never valid or invalid, sound or unsound. The conclusion of a valid argument follows from the premises of this argument. An argument is invalid iff it is not valid.