If the coordinates of the ends of a focal chord of the parabola $x^2=4ay$ are $(x_1, y_1)$ and $(x_2, y_2)$,then
- A$y_1 y_2 = 4a^2$
- B$y_1 y_2 = -4a^2$
- C$y_1 y_2 = -a^2$
- D$y_1 y_2 = a^2$
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