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Q.) If ( a, b, c, d in ε{R} ), then the equation ( (x^2 + ax -3b)(x^2 - cx + d)(x^2 - cx + b)(x^2 -dx +2b) = 0 ) has:
[A]6 real roots
[B]at least 2 real roots
[C]4 real roots
[D]3 real roots