Which of the following sets are subrings of the field R of real numbers? (a) A = {m+n√√2 | m, n = Z and n is even} (b) B = {m+n√√2 | m, n = Z and m is odd} (c) C = {a+b√√2 | a, b = Q} (d) D = {a+b√√/3 + c39 | a, b, c = Q} C (e) E = {m+nu | m, n = Z}, where u = (1+√√3)/2 (f) F = {m + nv | m, n = Z}, where v = (1 + √5)/2

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