Let A = {1}, B = {1, a, 2, b, c}, C = {b, c}, D = {a, b}, and E = {1, a, 2, b, c, d}. For each part, replace the symbol □ with either c or f to give a true statement.
(a) A □ B
(b) 0 □ A
(c) B □ C
(d) C □ E
(e) D □ C
(f) B □ E
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