If the normal to the parabola $y^2 = 4ax$ at the point with parameter $t_1$ cuts the parabola again at the point with parameter $t_2$,then:
- A$2 \leq t_2^2 \leq 8$
- B$2 \leq t_2^2 \leq 4$
- C$t_2^2 \geq 4$
- D$t_2^2 \geq 8$
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