Extracted text: d. Let X = {a, b, c, d},T= {0, X, {d}, {a, b}, {a, 6, d}} and Y = {m,n, p,q},F = {o, Y, {p}, {m,n}, {m,n,p}} Given the mapping f: (X,7) f(a) = m, f(b) = n, f(d) = p, f(c) = q.Then a. f is a continuous but not open mapping. b. f is an open but not continuous mapping. c. f is neither continuous nor open mapping. d. f is a continuous and open mapping. (Y, F) by H.