U = {w, o, r, d, l, e} A = {o, e} B = {w, o, r, d} C = {r, o, d,
w} D = {l, e, o} True or False? (2 points each): a) A ⊆ D b) U ⊂ D
c) B ⊂ C d) ∅ ⊂ B e) B ⊆ C