24. If the circles $x 2 + y 2 + 2 x + 2 k y + 6 = 0$ and $x 2 + y 2 + 2 k y + k = 0$ intersect orthogonally, then $k$ is :\\
(A) 2 or $- 3 / 2$\\
(B) - 2 or $3 / 2$\\
(C) 2 or $3 / 2$\\
(D) $( 2 , + \infty )$
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