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If pair of linear equations given by $a_1x + b_1y + c_1 = 0$ and $a_2x + b_2y + c_2 = 0$ has infinitely many solutions, then which of the following is definitely true ?
- (a)$\frac{a_1}{a_2} = \frac{c_2}{c_1}$
- (b)$a_1a_2 \neq b_1b_2$
- (c)$\frac{a_1}{a_2} = \frac{b_1}{b_2}$
- (d)$a_1b_2 = a_2b_1$
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(D) $a_1b_2 = a_2b_1$