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Q.) If the roots of the equation ( x^2 + 2ax+b = 0 ) are real and distinct and they differ by at most ( 2m ), then ( b ) lies in the interval:
[A]( a^2, a^2 + m^2 )
[B]( a^2-m^2, a^2 )
[C][ a^2 - m^2, a^2 )
[D]none of these