The points \( \left(a t_{1}^{2}, 2 a t_{1}\right),\left(a t_{2}^{2}, 2 a t_{2}\right) \) and \( ...
The points \( \left(a t_{1}^{2}, 2 a t_{1}\right),\left(a t_{2}^{2}, 2 a t_{2}\right) \) and \( (a, 0) \) will be collinear, if
(a) \( t_{1} t_{2}=1 \)
(b) \( t_{1} t_{2}=-1 \)
(c) \( t_{1}+t_{2}=1 \)
(d) \( t_{1}+t_{2}=-1 \)
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