Everything is given, plz answer

5. Generalizing the two examples given above, answer the following questions using the meet and join operations (the meet anb is the greatest element below a and b; the join a b is the least element above a and b): Given two objects 01, 02 at different security levels s and s, what is the minimal security level Lmin a subject u must have to be allowed to read both objects? (1 point) Given two subjects ui, u2 at different security levels $ and s2, what is the minimal security level Lmin an object o can have so that both subjects can still write on it? (1 point)