8. Are the following pairs of sets equal?

(a) A = {2} B = {x : x ∈ N, x is an even prime number}.
(b) P = {1, 4, 9} Q = {x : x = n2, n ∈ N, n ≤ 3)
(c) X = {x : x ∈ W, x < 5} Y = {x : x ∈ N, x ≤ 5}
(d) M = {a, b, c, d} N = {p, q, r, s}
(e) D = {x : x is a multiple of 30} E = {x : x is a factor of 10}