Let U = {q, r, s, t, u, v, w, x, y, z}, A = {q, s, u, w, y}, B = {q, s, y, z}, and C = {v, w, x, y, z}. Find the indicated set.
? 
A. {w, y}
B. {q, r, s, t, u, v, x, z}
C. {q, s, u, v, w, x, y, z}
D. {r, t}
Answer: D
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