Recall the general block matrix form of the k-th tableau Tk, i.e., the tableau obtained after performing k pivots on the initial tableau To: [ A I b -1 cT 0 0 R RA R Rb 1 1 cT - yTA -y -yb (a) When is T primal feasible? (b) When is T, dual feasible? (c) When is T (primal) degenerate? (d) When is T optimal? (e) How can you tell from T that the associated LP is unbounded?