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Q.) Portion of asymptote of hyperbola (x^2/a^2 )-(y^2/b^2)=1 (between centre and the tangent at vertex) in the first quadrant is cut by the line y+k(x-a) = 0 ( kis a parameter) then
[A]kεR
[B]kε (0,infi)
[C]kε (-0,0)
[D]none of these